Promethium

Promethium
61Pm
- ↑ Pm ↓ Np Tábìlì ìdásìkò neodymium ← promethium → samarium
Ìhànsójú
metallic
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà	promethium, Pm, 61
Ẹ̀ka ẹ́límẹ̀nti	lanthanide
Ẹgbẹ́, àsìkò, àdìpò	n/a, 6, f
Ìwúwo átọ́mù	[145]
Ìtòléra ẹ̀lẹ́ktrónì	[Xe] 4f5 6s2 2, 8, 18, 23, 8, 2
Physical properties
Phase	solid
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
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
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù 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

Promethium (pípè /prɵˈmiːθiəm/, pro-MEE-thee-əm) je apilese kemika to ni ami-idamo Pm ati nomba atomu 61. O yato si awon apilese yioku nitori pe oun nika ni apilese radioalagbara leyin technetium to je titele pelu awon apilese kemika ti awon isotopu won duro sinsin.