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 |
|
