57
La
Lanthanum
138.90547 | 2
8
18
18
9
2
|
57
La
Lanthanum
138.90547 | 2
8
18
18
9
2
|
| General |
|---|
| Name | Lanthanum | | Symbol | La | | Number | 57 | | Chemical series | Lanthanides | | Group / Period | 0 / 6 | | Block | f-block | | CAS registry number | 7439-91-0 |
| Physical properties |
|---|
| State | solid | | Density | 6.162 g/cm3 | | Melting point | 1193 K (920 °C, 1688 °F) | | Boiling point | 3737 K (3464 °C, 6267 °F) | | Critical point | |
| Atomic properties |
|---|
| Atomic Weight | 138.90547 g/mol | | Crystal structure | hexagonal | | Electronegativity | 1.10 | | Atomic radius | 195 pm | | Atomic radius (calculated) | | | Electron configuration | [Xe] 5d1 6s2 | | Electrons per shell | 2, 8, 18, 18, 9, 2 | | Number of protons | 57 | | Number of neutrons | 82 |
|
Cerium