Promethium

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Promethium,  61Pm
General properties
Appearance metallic
Mass nummer 145 (most stable isotope)
Promethium in the periodic cairt
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gowd Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
-

Pm

Np
neodymiumpromethiumsamarium
Atomic nummer (Z) 61
Group group n/a
Period period 6
Element category   lanthanide
Block f-block
Electron confeeguration [Xe] 6s2 4f5
Electrons per shell
2, 8, 18, 23, 8, 2
Pheesical properties
Phase (at STP) solit
Meltin pynt 1315 K ​(1042 °C, ​1908 °F)
Bylin pynt 3273 K ​(3000 °C, ​5432 °F)
Density (near r.t.) 7.26 g/cm3
Heat o fusion 7.13 kJ/mol
Heat o vapourisation 289 kJ/mol
Atomic properties
Oxidation states 3 (mildly basic oxide)
Electronegativity Pauling scale: ? 1.13
Atomic radius empirical: 183 pm
Covalent radius 199 pm
Coloyr lines in a spectral range
Spectral lines o Promethium
Miscellanea
Creestal structurhexagonal
Hexagonal creestal structur for promethium
Thermal expansion (r.t.) (α, poly)
est. 11 µm/(m·K)
Thermal conductivity 17.9 W/(m·K)
Electrical resistivity (r.t.) est. 0.75 µ Ω·m
Magnetic orderin paramagnetic[1]
Young's modulus (α form) est. 46 GPa
Shear modulus (α form) est. 18 GPa
Bouk modulus (α form) est. 33 GPa
Poisson ratio (α form) est. 0.28
CAS Nummer 7440-12-2
History
Diskivery Chien Shiung Wu, Emilio Segrè, Hans Bethe (1942)
First isolation Charles D. Coryell, Jacob A. Marinsky, Lawrence E. Glendenin, Harold G. Richter (1945)
Named bi Grace Mary Coryell (1945)
Main isotopes o promethium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
145Pm syn 17.7 y ε 145Nd
146Pm syn 5.53 y ε 146Nd
β 146Sm
147Pm trace 2.6234 y β 147Sm
| references | in Wikidata

Promethium, oreeginally prometheum, is a chemical element wi the seembol Pm an atomic nummer 61. Aw o its isotopes are radioactive; it is ane o anly twa sic elements that are follaed in the periodic cairt bi elements wi stable furms, a distinction shared wi technetium. Chemically, promethium is a lanthanide, which furms sauts when combined wi ither elements. Promethium shaws anly ane stable oxidation state o +3; houiver, a few +2 compoonds mey exist.

References[eedit | eedit soorce]

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.