Lanthanum
Lanthanum, 57La
 |
| General properties |
| Name, symbol
|
lanthanum, La |
| Pronunciation |
|
| Appearance |
silvery white |
|
| Lanthanum in the periodic table
|
|
|
| Atomic number (Z) |
57 |
|
Group, block
|
group 3, d-block
|
| Period |
period 6 |
| Element category |
lanthanide, sometimes considered a transition metal
|
|
Standard atomic weight (±) (Ar)
|
138.90547(7) |
| Electron configuration |
[Xe] 5d1 6s2
|
|
per shell
|
2, 8, 18, 18, 9, 2 |
| Physical properties |
| Phase |
solid |
| Melting point |
1193 K (920 °C, 1688 °F) |
| Boiling point |
3737 K (3464 °C, 6267 °F) |
|
Density near r.t.
|
6.162 g/cm3
|
| when liquid, at m.p. |
5.94 g/cm3
|
| Heat of fusion |
6.20 kJ/mol
|
| Heat of vaporization |
400 kJ/mol |
| Molar heat capacity |
27.11 J/(mol·K) |
|
Vapor pressure (extrapolated)
|
