Prometyo

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Promethium
61Pm
- ↑ Pm ↓ Np Periodic table neodymium ← promethium → samarium
Panagway
metallic
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	promethium, Pm, 61
Paglitok	/proʊˈmiːθiəm/ [[Help:Pronunciation respelling key|pro-Plantilya:Smallcaps all-thee-əm]]
Kategoriyang elemento	puthaw nga lantanido
Group, period, block	[[group {{{group}}} element|{{{group}}}]], 6, f
Gibug-aton sa atomo	[145]
Kontorno sa elektron	[Xe] 6s2 4f5 2, 8, 18, 23, 8, 2
History
Pagkadiskobre	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)
Physical properties
Phase	magahi
Density (near r.t.)	7.26 g·cm−3
Melting point	1315 K, 1042 °C, 1908 °F
Boiling point	3273 K, 3000 °C, 5432 °F
Heat of fusion	7.13 kJ·mol−1
Heat of vaporization	289 kJ·mol−1
Atomic properties
Oxidation states	3 (mildly basic oxide)
Electronegativity	? 1.13 (Pauling scale)
Ionization energies	1st: 540 kJ·mol−1
	2nd: 1050 kJ·mol−1
	3rd: 2150 kJ·mol−1
Atomic radius	183 pm
Covalent radius	199 pm
Miscellanea
Crystal structure	hexagonal
Magnetic ordering	paramagnetic[1]
Electrical resistivity	(r.t.) est. 0.75 µΩ·m
Thermal conductivity	17.9 W·m−1·K−1
Thermal expansion	(r.t.) (α, poly) est. 11 µm/(m·K)
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 registry number	7440-12-2
Most stable isotopes
Main article: Isotopes of promethium
iso NA half-life DM DE (MeV) DP 145Pm syn 17.7 y ε 0.163 145Nd 146Pm syn 5.53 y ε 1.472 146Nd β− 1.542 146Sm 147Pm trace 2.6234 y β− 0.224 147Sm
v t e · r

Ang prometyo (Iningles promethium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Pm ug kaiphan nga atomik 61. Ang prometyo mao ang puthaw nga lantanido.

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