Citizendia

87radon ← francium → radium
Cs
↑
Fr
↓
Uue
General
Name, Symbol, Numberfrancium, Fr, 87
Chemical seriesalkali metals
Group, Period, Block1, 7, s
Appearancemetallic
Standard atomic weight(223)  g·mol−1
Electron configuration[Rn] 7s1
Electrons per shell2, 8, 18, 32, 18, 8, 1
Physical properties
Phase ? solid
Density (near r.t.)1. Radon (ˈreɪdɒn is the Chemical element that has the symbol Rn and Atomic number 86 Radium (ˈreɪdiəm is a radioactive Chemical element which has the symbol Ra and Atomic number 88 Caesium or cesium (ˈsiːziəm is the Chemical element with the symbol Cs and Atomic number 55 |-||-| Ununennium (ˌjuːnəˈnɛniəm or /ˌʌnəˈnɛniəm/ or eka - Francium, is This is a typical display of the periodic table of the elements and contains the symbol and Atomic number of each element Wikipedia talkFeatured lists for an explanation of this and other inclusion tags below -->This is a list of Chemical elements, sorted by name Wikipedia talkFeatured lists for an explanation of this and other inclusion tags below -->This is a list of chemical elements by symbol, including the A table of Chemical elements ordered by Atomic number and color coded according to type of element In Chemistry a group, also known as a family, is a vertical column in the Periodic table of the Chemical elements There are 18 groups in Trends The alkali metals show a number of trends when moving down the group - for instance decreasing electronegativity increasing reactivity and decreasing melting and boiling In Chemistry a group, also known as a family, is a vertical column in the Periodic table of the Chemical elements There are 18 groups in In the Periodic table of the elements, a period is a horizontal row of the table A block of the Periodic table of elements is a set of adjacent groups The respective highest-energy electrons in each element in a block belong to the same Atomic Trends The alkali metals show a number of trends when moving down the group - for instance decreasing electronegativity increasing reactivity and decreasing melting and boiling A period 7 element is one of the Chemical elements in the seventh row (or period) of the periodic table of the elements. See also Electron configuration The atomic mass (ma is the Mass of an atom most often expressed in unified atomic mass units The atomic mass may be considered to be the total mass In Atomic physics and Quantum chemistry, electron configuration is the arrangement of Electrons in an Atom, Molecule, or other Radon (ˈreɪdɒn is the Chemical element that has the symbol Rn and Atomic number 86 The electron is a fundamental Subatomic particle that was identified and assigned the negative charge in 1897 by J An electron shell may be crudely thought of as an Orbit followed by Electrons around an Atom nucleus. In the Physical sciences a phase is a Set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties A solid' object is in the States of matter characterized by resistance to Deformation and changes of Volume. The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different Room temperature (also referred to as ambient temperature) is a common term to denote a certain Temperature within enclosed space at which humans are accustomed 87  g·cm−3
Melting point ? 300 K
(27 °C, 80 °F)
Boiling point ? 950 K
(? 677 °C, ? 1250 °F)
Heat of fusionca. The melting point of a solid is the temperature range at which it changes state from solid to Liquid. The kelvin (symbol K) is a unit increment of Temperature and is one of the seven SI base units The Kelvin scale is a thermodynamic The Celsius Temperature scale was previously known as the centigrade scale. Fahrenheit is a temperature scale named after Daniel Gabriel Fahrenheit (1686–1736 a German Physicist who proposed it in 1724 The boiling point of a liquid is the temperature at which the Vapor pressure of the liquid equals the environmental pressure surrounding the liquid The kelvin (symbol K) is a unit increment of Temperature and is one of the seven SI base units The Kelvin scale is a thermodynamic The Celsius Temperature scale was previously known as the centigrade scale. Fahrenheit is a temperature scale named after Daniel Gabriel Fahrenheit (1686–1736 a German Physicist who proposed it in 1724 The standard Enthalpy of fusion (symbol \Delta{}H_{fus} also known as the heat of fusion or specific melting heat, is the amount of 2  kJ·mol−1
Heat of vaporizationca. The joule per mole (symbol J·mol-1 is an SI derived unit of energy per amount of material The enthalpy of vaporization, (symbol \Delta{}_{v}H also known as the heat of vaporization or heat of evaporation, is the Energy required 65  kJ·mol−1
Vapor pressure (extrapolated)
P(Pa)1101001 k10 k100 k
at T(K)404454519608738946
Atomic properties
Crystal structure ? cubic body centered
Oxidation states1
(strongly basic oxide)
Electronegativity0. The joule per mole (symbol J·mol-1 is an SI derived unit of energy per amount of material Vapor pressure (also known as equilibrium vapor pressure or saturation vapor pressure) is the Pressure of a Vapor in equilibrium In Mineralogy and Crystallography, a crystal structure is a unique arrangement of Atoms in a Crystal. In Chemistry, the oxidation state is an indicator of the degree of Oxidation of an Atom in a Chemical compound. In Chemistry, a base is most commonly thought of as an aqueous substance that can accept Protons This refers to the Brønsted-Lowry theory of acids and " Electronegativity " is the opposite of " Electropositivity," which describes an element's ability to donate electrons 7 (Pauling scale)
Ionization energies1st: 380 kJ/mol
Miscellaneous
Magnetic ordering ?
Electrical resistivity ? 3 µΩ·m
Thermal conductivity(300 K)  ? 15  W·m−1·K−1
CAS registry number7440-73-5
Selected isotopes
Main article: Isotopes of francium
isoNAhalf-lifeDMDE (MeV)DP
221Frsyn4. The ionization potential, ionization energy or EI of an Atom or Molecule is the Energy required to remove an Electron The joule per mole (symbol J·mol-1 is an SI derived unit of energy per amount of material In Physics, magnetism is one of the Phenomena by which Materials exert attractive or repulsive Forces on other Materials. Electrical resistivity (also known as specific electrical resistance) is a measure of how strongly a material opposes the flow of Electric current. In Physics, thermal conductivity, k is the property of a material that indicates its ability to conduct Heat. CAS registry numbers are unique numerical identifiers for Chemical compounds Polymers biological sequences mixtures and Alloys They are also referred to Francium ( Fr) has no stable Isotopes. A standard Atomic mass cannot be given Isotopes (Greek isos = "equal" tópos = "site place" are any of the different types of atoms ( Nuclides In Chemistry, natural abundance (NA refers to the abundance Isotopes of a Chemical element as naturally found on a planet Half-Life (computer-game page here It's already listed in the disambiguation page Radioactive decay is the process in which an unstable Atomic nucleus loses energy by emitting ionizing particles and Radiation. The decay energy is the Energy released by a Nuclear decay. The energy difference of the Reactants is often written as Q: where Q In Nuclear physics, a decay product, also known as a daughter product, daughter isotope or daughter nuclide, is a Nuclide A synthetic radioisotope is a Radionuclide that is not found in nature no natural process or mechanism exists which produces it or it is so unstable that it decays away in 8 minα6. Alpha decay is a type of radioactive decay in which an Atomic nucleus emits an Alpha particle (two protons and two neutrons bound together into a particle 457217At
222Frsyn14. Astatine (ˈæstətiːn is a Radioactive Chemical element with the symbol At and Atomic number 85 2 minβ–2. In Nuclear physics, beta decay is a type of Radioactive decay in which a Beta particle (an Electron or a Positron) is emitted 033222Ra
223Frsyn22. Radium (ˈreɪdiəm is a radioactive Chemical element which has the symbol Ra and Atomic number 88 00 minβ–1. 149223Ra
α5. 430219At
References

Francium (pronounced /ˈfrænsiəm/), formerly known as eka-caesium and actinium K,[1] is a chemical element that has the symbol Fr and atomic number 87. Recommended values for many properties of the elements together with various references are collected on these data pages Caesium or cesium (ˈsiːziəm is the Chemical element with the symbol Cs and Atomic number 55 Actinium (ækˈtɪniəm is a radioactive Chemical element with the symbol Ac and Atomic number 89 which was discovered in 1899, the earliest A chemical element is a type of Atom that is distinguished by its Atomic number; that is by the number of Protons in its nucleus. See also List of elements by atomic number In Chemistry and Physics, the atomic number (also known as the proton It has the lowest known electronegativity of all known elements, and is the second rarest naturally occurring element (after astatine). " Electronegativity " is the opposite of " Electropositivity," which describes an element's ability to donate electrons See also Abundances of the elements (data page The abundance of a Chemical element measures how relatively common the element is or how much of the element Astatine (ˈæstətiːn is a Radioactive Chemical element with the symbol At and Atomic number 85 Francium is a highly radioactive metal that decays into astatine, radium, and radon. Radioactive decay is the process in which an unstable Atomic nucleus loses energy by emitting ionizing particles and Radiation. Radium (ˈreɪdiəm is a radioactive Chemical element which has the symbol Ra and Atomic number 88 Radon (ˈreɪdɒn is the Chemical element that has the symbol Rn and Atomic number 86 As an alkali metal, it has one valence electron. Trends The alkali metals show a number of trends when moving down the group - for instance decreasing electronegativity increasing reactivity and decreasing melting and boiling In chemistry valence electrons are the Electrons contained in the outermost or valence, Electron shell of an Atom.

Francium was discovered by Marguerite Perey in France (from which the element takes its name) in 1939. Marguerite Catherine Perey (19 October 1909 &ndash 13 May 1975 was a French Physicist. This article is about the country For a topic outline on this subject see List of basic France topics. It was the last element discovered in nature, rather than synthesized. Nature, in the broadest sense is equivalent to the natural world, physical universe, material world or material universe. [2] Outside the laboratory, francium is extremely rare, with trace amounts found in uranium and thorium ores, where the isotope francium-223 continually forms and decays. Uranium (jʊˈreɪniəm is a silvery-gray Metallic Chemical element in the Thorium (ˈθɔːriəm is a Chemical element with the symbol Th and Atomic number 90 Isotopes (Greek isos = "equal" tópos = "site place" are any of the different types of atoms ( Nuclides As little as 30 g (one ounce) exists at any given time throughout the Earth's crust; the other isotopes are entirely synthetic. EARTH was a short-lived Japanese vocal trio which released 6 singles and 1 album between 2000 and 2001 In Geology, a crust is the outermost solid shell of a planet or moon The largest amount ever collected of any isotope was a cluster of 10,000 atoms (of francium-210) created as an ultracold gas at Stony Brook in 1997. Ultracold atoms is a term used to describe atoms that are maintained at temperatures close to 0 Kelvin ( Absolute zero) typically below some tenths of μK State University of New York at Stony Brook, commonly known as Stony Brook University, is a public research university located in Stony Brook, New York [3]

Contents

Characteristics

Francium is less stable than any other element lighter than element 106, seaborgium:[3] its most stable isotope, francium-223, has a half-life of less than 22 minutes. Seaborgium (siːˈbɔrgiəm is a Chemical element in the Periodic table that has the symbol Sg and Atomic number 106 Image of Seaborgium Half-Life (computer-game page here It's already listed in the disambiguation page By contrast, astatine, the second-least stable naturally occurring element, has a maximum half-life of 8. Astatine (ˈæstətiːn is a Radioactive Chemical element with the symbol At and Atomic number 85 5 hours. [4] All isotopes of francium decay into either astatine, radium, or radon. [4]

Francium is an alkali metal whose chemical properties most resemble those of caesium. Trends The alkali metals show a number of trends when moving down the group - for instance decreasing electronegativity increasing reactivity and decreasing melting and boiling Caesium or cesium (ˈsiːziəm is the Chemical element with the symbol Cs and Atomic number 55 [3] A very heavy element with a single valence electron,[5] it has the highest equivalent weight of any element. In chemistry valence electrons are the Electrons contained in the outermost or valence, Electron shell of an Atom. Equivalent weight is the amount of an element that reacts or is involved in reaction with 1 mole of electrons [3] Similarly, francium has the lowest electronegativity of all the known elements at 0. " Electronegativity " is the opposite of " Electropositivity," which describes an element's ability to donate electrons 7 on the Pauling scale;[6] caesium has the second-lowest at 0. " Electronegativity " is the opposite of " Electropositivity," which describes an element's ability to donate electrons Caesium or cesium (ˈsiːziəm is the Chemical element with the symbol Cs and Atomic number 55 79. [7] Liquid francium — if such a substance were to be created — should have a surface tension of 0. For the work of fiction see Surface Tension (short story. Surface tension is a property of the surface of a Liquid that causes it to 05092 N/m at its melting point. The newton (symbol N) is the SI derived unit of Force, named after Isaac Newton in recognition of his work on Classical The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International [8] Francium coprecipitates with several caesium salts, such as caesium perchlorate, which results in small amounts of francium perchlorate. In Chemistry, coprecipitation (CPT or co-precipitation is the carrying down by a Precipitate of substances normally soluble under the conditions employed Salt is a Dietary mineral composed primarily of Sodium chloride that is essential for Animal life but toxic to most land plants Caesium perchlorate, CsClO4 (also known as cesium perchlorate is a Perchlorate of Caesium. This coprecipitation can be used to isolate francium, by adapting the radiocaesium coprecipitation method of Glendenin and Nelson. It will additionally coprecipitate with many other caesium salts, including the iodate, the picrate, the tartrate (also rubidium tartrate), the chloroplatinate, and the silicotungstate. An iodate is a Salt of Iodic acid. In the iodate Anion, Iodine is bonded to three Oxygen atoms and the Molecular formula A picrate is a Salt or an Ester of Picric acid (a 246-trinitrophenol A tartrate is a Salt or Ester of the Organic compound Tartaric acid, a Dicarboxylic acid. Rubidium (ruːˈbɪdiəm /rəˈbɪdiəm/ is a Chemical element with the symbol Rb and Atomic number 37 It also coprecipitates with silicotungstic acid, and with perchloric acid, without another alkali metal as a carrier, which provides other methods of separation. Tungstosilicic acid is the most commonly encountered Heteropoly acid. Perchloric acid, HClO4 is an Oxoacid of Chlorine and is a colorless liquid soluble in water. In Chemistry, coprecipitation (CPT or co-precipitation is the carrying down by a Precipitate of substances normally soluble under the conditions employed [9][10] Nearly all francium salts are water-soluble. Solubility is the characteristic Physical property referring to the ability of a given substance the Solute, to dissolve in a Solvent. [11]

Applications

Due to its instability and rarity[12][13][14][15][16] there are no commercial applications for francium. It has been used for research purposes in the fields of biology and of atomic structure. Foundations of modern biology There are five unifying principles History See also Atomic theory, Atomism The concept that matter is composed of discrete units and cannot be divided into arbitrarily tiny Its use as a potential diagnostic aid for various cancers has also been explored,[4] but this application has been deemed impractical. Cancer (medical term Malignant Neoplasm) is a class of Diseases in which a group of cells display uncontrolled [14]

Francium's ability to be synthesized, trapped, and cooled, along with its relatively simple atomic structure have made it the subject of specialized spectroscopy experiments. History See also Atomic theory, Atomism The concept that matter is composed of discrete units and cannot be divided into arbitrarily tiny Spectroscopy was originally the study of the interaction between Radiation and Matter as a function of Wavelength (λ These experiments have led to more specific information regarding energy levels and the coupling constants between subatomic particles. A quantum mechanical system or particle that is bound, confined spacially can only take on certain discrete values of energy as opposed to classical particles which In Physics, a coupling constant, usually denoted g, is a number that determines the strength of an Interaction. A subatomic particle is an elementary or composite Particle smaller than an Atom. [17] Studies on the light emitted by laser-trapped francium-210 ions have provided accurate data on transitions between atomic energy levels which are fairly similar to those predicted by quantum theory. Quantum mechanics is the study of mechanical systems whose dimensions are close to the Atomic scale such as Molecules Atoms Electrons [18]

History

As early as 1870, chemists thought that there should be an alkali metal beyond caesium, with an atomic number of 87. Caesium or cesium (ˈsiːziəm is the Chemical element with the symbol Cs and Atomic number 55 [4] It was then referred to by the provisional name eka-caesium. Professor Dmitri Mendeleev published the first Periodic Table of the Atomic Elements in 1869 based on properties which appeared with some regularity as he laid out the elements [19] Research teams attempted to locate and isolate this missing element, and at least four false claims were made that the element had been found before an authentic discovery was made.

Erroneous and incomplete discoveries

Russian chemist D. K. Dobroserdov was the first scientist to claim to have found eka-caesium, or francium. In 1925, he observed weak radioactivity in a sample of potassium, another alkali metal, and concluded that eka-caesium was contaminating the sample. Potassium (pəˈtæsiəm is a Chemical element. It has the symbol K (kalium from qalīy Atomic number 19 and Atomic mass 39 [20] He then published a thesis on his predictions of the properties of eka-caesium, in which he named the element russium after his home country. [21] Shortly thereafter, Dobroserdov began to focus on his teaching career at the Polytechnic Institute of Odessa, and he did not pursue the element further. [20]

The following year, English chemists Gerald J. England is a Country which is part of the United Kingdom. Its inhabitants account for more than 83% of the total UK population whilst its mainland F. Druce and Frederick H. Loring analyzed X-ray photographs of manganese(II) sulfate. X-radiation (composed of X-rays) is a form of Electromagnetic radiation. Manganese(II sulfate is the Inorganic compound with the formula MnSO4 [21] They observed spectral lines which they presumed to be of eka-caesium. They announced their discovery of element 87 and proposed the name alkalinium, as it would be the heaviest alkali metal. [20]

In 1930, Fred Allison of the Alabama Polytechnic Institute claimed to have discovered element 87 when analyzing pollucite and lepidolite using his magneto-optical machine. Auburn University ( AU or Auburn) is a State university located in Auburn, Alabama, U Pollucite is a Zeolite mineral with the formula ( Cs, Na)2 Al 2 Si 4 O 12·2 H2O Lepidolite (KLi2Al(AlSi3O10(FOH2 is a lilac or rose-violet colored phyllosilicate Mineral of the Mica group A magneto-optic effect is any one of a number of phenomena in which an Electromagnetic wave propagates through a medium that has been altered by the presence of a quasistatic Allison requested that it be named virginium after his home state of Virginia, along with the symbols Vi and Vm. The Commonwealth of Virginia ( is an American state [21][22] In 1934, however, H. G. MacPherson of UC Berkeley disproved the effectiveness of Allison's device and the validity of this false discovery. The University of California Berkeley (also referred to as Cal, Berkeley and UC Berkeley) is a major research university located in Berkeley [23]

In 1936, Romanian chemist Horia Hulubei and his French colleague Yvette Cauchois also analyzed pollucite, this time using their high-resolution X-ray apparatus. [20] They observed several weak emission lines, which they presumed to be those of element 87. Hulubei and Cauchois reported their discovery and proposed the name moldavium, along with the symbol Ml, after Moldavia, the Romanian province where they conducted their work. Moldavia (Moldova is a geographic and historical region and former Principality in Eastern Europe, corresponding to the territory between Eastern Carpathians [21] In 1937, Hulubei's work was criticized by American physicist F. H. Hirsh Jr. , who rejected Hulubei's research methods. Hirsh was certain that eka-caesium would not be found in nature, and that Hulubei had instead observed mercury or bismuth X-ray lines. Mercury (ˈmɜrkjʊri also called quicksilver or hydrargyrum, is a Chemical element with the symbol Hg ( Latinized hydrargyrum Bismuth (ˈbɪzməθ is a Chemical element that has the symbol Bi and Atomic number 83 Hulubei, however, insisted that his X-ray apparatus and methods were too accurate to make such a mistake. Because of this, Jean Baptiste Perrin, Nobel Prize winner and Hulubei's mentor, endorsed moldavium as the true eka-caesium over Marguerite Perey's recently discovered francium. Jean Baptiste Perrin ( September 30, 1870 &ndash April 17, 1942) was a French Physicist and Nobel laureate. The Nobel Prize (Nobelpriset (Nobelprisen is a Swedish prize established in the 1895 will of Swedish chemist Alfred Nobel; it was first awarded in Peace, Literature Marguerite Catherine Perey (19 October 1909 &ndash 13 May 1975 was a French Physicist. Perey, however, continuously criticized Hulubei's work until she was credited as the sole discoverer of element 87. [20]

Perey's analysis

Eka-caesium was discovered in 1939 by Marguerite Perey of the Curie Institute in Paris, France when she purified a sample of actinium-227 which had been reported to have a decay energy of 220 keV. Marguerite Catherine Perey (19 October 1909 &ndash 13 May 1975 was a French Physicist. The Curie Institute is one of the leading medical biological and biophysical research centres in the world Paris (ˈpærɨs in English; in French) is the Capital of France and the country's largest city Actinium (ækˈtɪniəm is a radioactive Chemical element with the symbol Ac and Atomic number 89 which was discovered in 1899, the earliest However, Perey noticed decay particles with an energy level below 80 keV. Perey thought this decay activity might have been caused by a previously unidentified decay product, one which was separated during purification, but emerged again out of the pure actinium-227. Various tests eliminated the possibility of the unknown element being thorium, radium, lead, bismuth, or thallium. Thorium (ˈθɔːriəm is a Chemical element with the symbol Th and Atomic number 90 Characteristics Lead has a dull luster and is a dense, Ductile, very soft highly Thallium (ˈθæliəm is a Chemical element with the symbol Tl and Atomic number 81 The new product exhibited chemical properties of an alkali metal (such as coprecipitating with caesium salts), which led Perey to believe that it was element 87, caused by the alpha decay of actinium-227. Alpha decay is a type of radioactive decay in which an Atomic nucleus emits an Alpha particle (two protons and two neutrons bound together into a particle [19] Perey then attempted to determine the proportion of beta decay to alpha decay in actinium-227. In Nuclear physics, beta decay is a type of Radioactive decay in which a Beta particle (an Electron or a Positron) is emitted Her first test put the alpha branching at 0. 6%, a figure which she later revised to 1%. [24]

Perey named the new isotope actinium-K (now referred to as francium-223)[19] and in 1946, she proposed the name catium for her newly discovered element, as she believed it to be the most electropositive cation of the elements. " Electronegativity " is the opposite of " Electropositivity," which describes an element's ability to donate electrons An ion is an Atom or Molecule which has lost or gained one or more Valence electrons giving it a positive or negative electrical charge Irène Joliot-Curie, one of Perey's supervisors, opposed the name due to its connotation of cat rather than cation. Irène Joliot-Curie ( 12 September 1897 &ndash 17 March 1956) was a French scientist the Daughter of Marie Skłodowska-Curie [19] Perey then suggested francium, after France. This name was officially adopted by the International Union of Pure and Applied Chemistry in 1949,[4] becoming the second element after gallium to be named after France. The International Union of Pure and Applied Chemistry ( IUPAC) (aɪjuːpæk or ay-yoo-pec) is an international Non-governmental organization Gallium (ˈgæliəm is a Chemical element that has the symbol Ga and Atomic number 31 It was assigned the symbol Fa, but this abbreviation was revised to the current Fr shortly thereafter. [25] Francium was the last naturally occurring element to be discovered, following rhenium in 1925. Rhenium (ˈriːniəm is a Chemical element with the symbol Re and Atomic number 75 [19] Further research into francium's structure was carried out by, among others, Sylvain Lieberman and his team at CERN in the 1970s and 1980s. The European Organization for Nuclear Research (Organisation Européenne pour la Recherche Nucléaire known as CERN [26]

Occurrence

Natural

Francium-223 is the result of the alpha decay of actinium-227 and can be found in trace amounts in uranium and thorium minerals. Uranium (jʊˈreɪniəm is a silvery-gray Metallic Chemical element in the Thorium (ˈθɔːriəm is a Chemical element with the symbol Th and Atomic number 90 A mineral is a naturally occurring substance formed through geological processes that has a characteristic chemical composition a highly ordered atomic structure and specific [3] In a given sample of uranium, there is estimated to be only one francium atom for every 1×1018 uranium atoms. [14] It is also calculated that there is at most 30 g of francium in the earth's crust at any time. For other uses of the words gram or gramme see Gram (disambiguation. In Geology, a crust is the outermost solid shell of a planet or moon [27] This makes it the second rarest element in the crust after astatine. See also Abundances of the elements (data page The abundance of a Chemical element measures how relatively common the element is or how much of the element Astatine (ˈæstətiːn is a Radioactive Chemical element with the symbol At and Atomic number 85 [4][14]

Synthesized

In the MOT, a magnetic field is created by the copper solenoids. Neutral francium atoms enter the glass bulb from the left and are trapped by lasers.
In the MOT, a magnetic field is created by the copper solenoids. Neutral francium atoms enter the glass bulb from the left and are trapped by lasers. [28]

Francium can be synthesized in the nuclear reaction 197Au + 18O → 210Fr + 5n. This process, developed by Stony Brook Physics, yields francium isotopes with masses of 209, 210, and 211,[29] which are then isolated by the magneto-optic trap (MOT). State University of New York at Stony Brook, commonly known as Stony Brook University, is a public research university located in Stony Brook, New York A magneto-optic effect is any one of a number of phenomena in which an Electromagnetic wave propagates through a medium that has been altered by the presence of a quasistatic [28] Other synthesis methods include bombarding radium with neutrons, and bombarding thorium with protons, deuterons, or helium ions. Deuterium, also called heavy hydrogen, is a Stable isotope of Hydrogen with a Natural abundance in the Oceans of Earth Helium ( He) is a colorless odorless tasteless non-toxic Inert Monatomic Chemical An ion is an Atom or Molecule which has lost or gained one or more Valence electrons giving it a positive or negative electrical charge [24] Francium has not yet, as of 2006, been synthesized in amounts large enough to weigh. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. [3][4][14][30]

Isotopes

Main article: Isotopes of francium

There are 34 known isotopes of francium ranging in atomic mass from 199 to 232. Francium ( Fr) has no stable Isotopes. A standard Atomic mass cannot be given The atomic mass (ma is the Mass of an atom most often expressed in unified atomic mass units The atomic mass may be considered to be the total mass [3] Francium has seven metastable nuclear isomers. Metastability is a general scientific concept which describes states of delicate equilibrium A nuclear isomer is a Metastable state of an Atomic nucleus caused by the excitation of one or more of its Nucleons A nuclear isomer occupies [3] Francium-223 and francium-221 are the only isotopes that occur in nature, though the former is far more common. [31]

Francium-223 is the most stable isotope with a half-life of 21. 8 minutes,[3] and it is highly unlikely that an isotope of francium with a longer half-life will ever be discovered or synthesized. [24] Francium-223 is the fifth product of the actinium decay series as the daughter isotope of actinium-227. Actinium (ækˈtɪniəm is a radioactive Chemical element with the symbol Ac and Atomic number 89 which was discovered in 1899, the earliest [16] Francium-223 then decays into radium-223 by beta decay (1149 keV decay energy), with a minor (0. In Nuclear physics, beta decay is a type of Radioactive decay in which a Beta particle (an Electron or a Positron) is emitted The decay energy is the Energy released by a Nuclear decay. The energy difference of the Reactants is often written as Q: where Q 006%) alpha decay path to astatine-219 (5. Alpha decay is a type of radioactive decay in which an Atomic nucleus emits an Alpha particle (two protons and two neutrons bound together into a particle 4 MeV decay energy). [32]

Francium-221 has a half-life of 4. 8 minutes. [3] It is the ninth product of the neptunium decay series as a daughter isotope of actinium-225. Neptunium (nɛpˈtjuːniəm is a Chemical element with the symbol Np and Atomic number 93 [16] Francium-221 then decays into astatine-217 by alpha decay (6. 457 MeV decay energy). [3]

The least stable ground state isotope is francium-215, with a half-life of 0. In Quantum mechanics, a stationary state is an Eigenstate of a Hamiltonian, or in other words a state of definite energy 12 μs. (9. 54 MeV alpha decay to astatine-211):[3] Its metastable isomer, francium-215m, is less stable still, with a half-life of only 3. A nuclear isomer is a Metastable state of an Atomic nucleus caused by the excitation of one or more of its Nucleons A nuclear isomer occupies 5 ns. [33]

See also

References

  1. ^ Actually the least unstable isotope, Fr-223
  2. ^ Some synthetic elements, like technetium, have later been found in nature. Technetium (tɛkˈniːʃɪəm is the lightest Chemical element with no Stable isotope.
  3. ^ a b c d e f g h i j k l CRC Handbook of Chemistry and Physics, vol. 4, CRC, 2006, pp. 12, 0-8493-0474-1 
  4. ^ a b c d e f g Price, Andy (2004-12-20). "MMIV" redirects here For the Modest Mouse album see " Baron von Bullshit Rides Again " Events 69 - Vespasian, formerly a general under Nero, enters Rome to claim the title of Emperor. Francium. Retrieved on 2007-03-25. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1199 - Richard I is wounded by a crossbow bolt while fighting France which leads to his death on April 6.
  5. ^ Winter, Mark. Electron Configuration. Francium. The University of Sheffield. Retrieved on 2007-04-18. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1025 - Bolesław Chrobry is crowned in Gniezno, becoming the first King of Poland.
  6. ^ Pauling, Linus (1960). Linus Carl Pauling (February 28 1901 – August 19 1994 was an American Scientist, Peace activist, Author and educator. The Nature of the Chemical Bond (3rd Edn. ). Cornell University Press, 93.  
  7. ^ Winter, Mark. Electronegativies. Caesium. The University of Sheffield. Retrieved on 2007-05-09. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1457 BC - Battle of Megiddo (15th century BC between Thutmose III and a large Canaanite coalition under the King of Pauling places caesium and francium with the same electronegativity.
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  17. ^ Gomez, E; Orozco, L A, and Sprouse, G D (2005-11-07). "Spectroscopy with trapped francium: advances and perspectives for weak interaction studies". Rep. Prog. Phys. 69 (1): 79–118. doi:10.1088/0034-4885/69/1/R02. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.  
  18. ^ Peterson, I. "Creating, cooling, trapping francium atoms", Science News, 1996-05-11, pp. Year 1996 ( MCMXCVI) was a Leap year starting on Monday (link will display full 1996 Gregorian calendar) Events 330 - Byzantium is renamed ''Nova Roma'' during a dedication ceremony but is more popularly referred to as Constantinople  294. Retrieved on 2007-04-11. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 491 - Flavius Anastasius becomes Byzantine Emperor, with the name of Anastasius I.  
  19. ^ a b c d e Adloff, Jean-Pierre; Kaufman, George B. (2005-09-25). Year 2005 ( MMV) was a Common year starting on Saturday (link displays full calendar of the Gregorian calendar. Events 303 - On a voyage preaching the Gospel, Saint Fermin of Pamplona is beheaded in Amiens, France Francium (Atomic Number 87), the Last Discovered Natural Element. The Chemical Educator 10 (5). Retrieved on 2007-03-26. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1026 - Pope John XIX crowns Conrad II as Holy Roman Emperor.
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  25. ^ Grant, Julius (1969), “Francium”, Hackh's Chemical Dictionary, McGraw-Hill, pp. 279–280 
  26. ^ History. Francium. SUNY Stony Brook Physics & Astronomy (2007-02-20). State University of New York at Stony Brook, commonly known as Stony Brook University, is a public research university located in Stony Brook, New York Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1472 - Orkney and Shetland are left by Norway to Scotland, due to a Dowry payment Retrieved on 2007-03-26. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1026 - Pope John XIX crowns Conrad II as Holy Roman Emperor.
  27. ^ Winter, Mark. Geological information. Francium. The University of Sheffield. Retrieved on 2007-03-26. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1026 - Pope John XIX crowns Conrad II as Holy Roman Emperor.
  28. ^ a b Cooling and Trapping. Francium. SUNY Stony Brook Physics & Astronomy (2007-02-20). State University of New York at Stony Brook, commonly known as Stony Brook University, is a public research university located in Stony Brook, New York Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1472 - Orkney and Shetland are left by Norway to Scotland, due to a Dowry payment Retrieved on 2007-05-01. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 305 - Diocletian and Maximian retire from the office of Roman Emperor.
  29. ^ Production of Francium. Francium. SUNY Stony Brook Physics & Astronomy (2007-02-20). State University of New York at Stony Brook, commonly known as Stony Brook University, is a public research university located in Stony Brook, New York Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1472 - Orkney and Shetland are left by Norway to Scotland, due to a Dowry payment Retrieved on 2007-03-26. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1026 - Pope John XIX crowns Conrad II as Holy Roman Emperor.
  30. ^ Francium. Los Alamos Chemistry Division (2003-12-15). Year 2003 ( MMIII) was a Common year starting on Wednesday of the Gregorian calendar. Events 533 - Byzantine general Belisarius defeats the Vandals, commanded by King Gelimer, at the Battle of Retrieved on 2007-03-29. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1461 - Wars of the Roses: Battle of Towton - Edward of York defeats Queen Margaret to become King
  31. ^ Considine, Glenn D. , ed. (2005), “Francium”, Van Nostrand's Encyclopedia of Chemistry, New York: Wylie-Interscience, pp. 679, ISBN 0-471-61525-0 
  32. ^ National Nuclear Data Center (1990). Table of Isotopes decay data. Brookhaven National Laboratory. Brookhaven National Laboratory ( BNL) is a United States national laboratory located in Upton New York on Long Island, and was formally established Retrieved on 2007-04-04. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1581 - Francis Drake completes a circumnavigation of the world and is knighted by Elizabeth I. .
  33. ^ National Nuclear Data Center (2003). Fr Isotopes. Brookhaven National Laboratory. Brookhaven National Laboratory ( BNL) is a United States national laboratory located in Upton New York on Long Island, and was formally established Retrieved on 2007-04-04. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1581 - Francis Drake completes a circumnavigation of the world and is knighted by Elizabeth I. .

External links

Dictionary

francium

-noun

  1. A metallic chemical element (symbol Fr) with an atomic number of 87.
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