మూస:Infobox promethium

ప్రొమేథియం, ₀₀Pm

ప్రొమేథియం
Pronunciation	/proʊˈmiːθiəm/ ​(proh-MEE-thee-əm)
Appearance	metallic
Mass number	[145]
ప్రొమేథియం in the periodic table
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 Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver 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 Gold Mercury (element) Thallium Lead 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 నియోడిమియం ← ప్రొమేథియం → సమేరియం
Group	మూస:Infobox element/symbol-to-group/format
Period	period 6
Block	f-block
Electron configuration	[Xe] 4f5 6s2
Electrons per shell	2, 8, 18, 23, 8, 2
Physical properties
Phase at STP	solid
Melting point	1315 K ​(1042 °C, ​1908 °F)
Boiling point	3273 K ​(3000 °C, ​5432 °F)
Density (near r.t.)	7.26 g/cm3
Heat of fusion	7.13 kJ/mol
Heat of vaporization	289 kJ/mol
Atomic properties
Oxidation states	+2, +3 (a mildly basic oxide)
Electronegativity	Pauling scale: ? 1.13
Atomic radius	empirical: 183 pm
Covalent radius	199 pm
Spectral lines of ప్రొమేథియం
Other properties
Natural occurrence	from decay
Crystal structure	​hexagonal
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 ordering	paramagnetic
Young's modulus	(α form) est. 46 GPa
Shear modulus	(α form) est. 18 GPa
Bulk modulus	(α form) est. 33 GPa
Poisson ratio	(α form) est. 0.28
CAS Number	7440-12-2
History
Discovery	Chien Shiung Wu, Emilio Segrè, Hans Bethe (1942)
First isolation	Charles D. Coryell, Jacob A. Marinsky, Lawrence E. Glendenin, Harold G. Richter (1945)
Named by	Grace Mary Coryell (1945)
Isotopes of ప్రొమేథియం

References

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