Praseodymium
Pr
Praseodymium
Rare Earth
Atomic number:
59
Atomic weight:
140.90765
Shells:
2,8,18,21,8,2
Orbitals:
[Xe] 4f3 6s2
Melting point:
931°C
Boiling point:
3520°C
Covalent radius:
1.65
Å
Atomic volume:
20.8
cm³/mol
Atomic radius:
2.67
Å
Ionic radius:
1.13 (+3)
Å
Electronegativity:
1.13
Oxidation states:
(3,4)
1st ionization pot.:
5.464
V
2nd ionization pot.:
10.551
V
3rd ionization pot.:
21.62
V
Specific heat:
0.19
J/gK
Heat of fusion:
6.890
kJ/mol
Heat of vapor.:
296.80
kJ/mol
Thermal conduct.:
0.125
W/cmK
Electrical conduct.:
0.0148
10^6/cm ohm
Density:
6.77
g/cm³
Valence:
3
