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 .
Quick Facts Promethium, Panagway ...
Promethium
61
Panagway
metallic
Kinatibuk-ang mga kinaiya
Ngalan, simbolo , kaiphan
promethium, Pm, 61
Paglitok
[[Help:Pronunciation respelling key|pro-Plantilya:Smallcaps all ]]
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 Electron shells of promethium (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)
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
145 Pmsyn 17.7 y
ε 0.163
145 Nd
146 Pmsyn 5.53 y
ε
1.472
146 Nd
β−
1.542
146 Sm
147 Pmtrace 2.6234 y
β− 0.224
147 Sm
· r
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