Lantanum (La)
Lantanum is the chemical element with atomic number 57 and symbol La. It is a lantanida in period 6, with a standard atomic weight of 138.91 u.
Fakta utama
- Z
- 57
- Atomic weight
- 138.91 u
- Category
- lantanida
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1839
- CAS
- 7439-91-0
Sifat terukur
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.1 | National Center for Biotechnology Information (NIH) |
| Melting point | 1,191 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 3,737 K | National Center for Biotechnology Information (NIH) |
| Density stp | 6.15 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 240 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 538.1 kJ/mol | National Center for Biotechnology Information (NIH) |
| Electron affinity | 48.2 kJ/mol | National Center for Biotechnology Information (NIH) |
Konfigurasi elektron
- Noble gas notation
- [Xe] 5d¹ 6s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 5d¹ 6s²
- Electrons per shell
- 2, 8, 18, 18, 9, 2