Promethium

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Promethium
61Pm
-

Pm

Np
neodymiumpromethiumsamarium
Ìhànsójú
metallic
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà promethium, Pm, 61
Ẹ̀ka ẹ́límẹ̀nti lanthanide
Ẹgbẹ́, àsìkò, àdìpò n/a6, 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
Promethium has a hexagonal crystal structure
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
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
· r

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.


Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

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