Kobalt (Co)
Kobalt is the chemical element with atomic number 27 and symbol Co. It is a logam transisi in period 4, group 9, with a standard atomic weight of 58.933 u.
Fakta utama
- Z
- 27
- Atomic weight
- 58.933 u
- Category
- logam transisi
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1735
- CAS
- 7440-48-4
Sifat terukur
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.88 | National Center for Biotechnology Information (NIH) |
| Melting point | 1,768 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 3,200 K | National Center for Biotechnology Information (NIH) |
| Density stp | 8.86 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 192 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 760.4 kJ/mol | National Center for Biotechnology Information (NIH) |
| Electron affinity | 63.8 kJ/mol | National Center for Biotechnology Information (NIH) |
Konfigurasi elektron
- Noble gas notation
- [Ar] 3d⁷ 4s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁷ 4s²
- Electrons per shell
- 2, 8, 15, 2