Template:Infobox promethium

Promethium, ₆₁Pm

Promethium
Pronunciation	/proʊˈmiːθiəm/ ​(proh-MEE-thee-əm)
Appearance	metallic
Mass number	[145]
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 neodymium ← promethium → samarium
Atomic nummer (Z)	61
Group	group n/a
Period	period 6
Block	f-block
Element category	Lanthanide
Electron confeeguration	[Xe] 4f5 6s2
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	+2, +3 (a mildly basic oxide)
Electronegativity	Pauling scale: ? 1.13
Atomic radius	empirical: 183 pm
Covalent radius	199 pm
Colour lines in a spectral range Spectral lines o promethium
Ither properties
Naitural occurrence	from decay
Creestal structur	​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 orderin	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 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 by	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

style="text-align:left"| data m.p. cat
	in	calc from C	diff	report	ref
C	1042	—	—
K	1315	1315	0
F	1908	1908	0
WD	!
input	C: 1042, K: 1315, F: 1908
comment

style="text-align:left"| data b.p. cat
	in	calc from C	diff	report	ref
C	3000	—	—
K	3273	3270	3
F	5432	5430	2
WD	!
input	C: 3000, K: 3273, F: 5432
comment

References

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