Promethium
Atomic number:
61
Atomic weight:
(144.9127)
Shells:
2,8,18,23,8,2
Orbitals:
[Xe] 4f5 6s2
Melting point:
1042°C
Boiling point:
3000°C (estimated)
Covalent radius:
1.63
Å
Atomic volume:
22.39
cm³/mol
Atomic radius:
2.62
Å
Ionic radius:
1.09 (+3)
Å
Electronegativity:
1.13
Oxidation states:
1st ionization pot.:
5.55
V
2nd ionization pot.:
10.903
V
3rd ionization pot.:
22.283
V
Specific heat:
0.18
J/gK
Heat of fusion:
--
kJ/mol
Heat of vapor.:
--
kJ/mol
Thermal conduct.:
0.179
W/cmK
Electrical conduct.:
--
10^6/cm ohm
Density:
6.475
g/cm³
Valence:
3
