Nickel (Ni)
Nickel is the chemical element with atomic number 28 and symbol Ni. It is a transition metal in period 4, group 10, with a standard atomic weight of 58.693 u.
Key facts
- Z
- 28
- Atomic weight
- 58.693 u
- Category
- transition metal
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1751
- CAS
- 7440-02-0
Measured properties
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.91 | National Center for Biotechnology Information (NIH) |
| Melting point | 1,728 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 3,186 K | National Center for Biotechnology Information (NIH) |
| Density stp | 8.912 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 163 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 737.1 kJ/mol | National Center for Biotechnology Information (NIH) |
| Electron affinity | 111.5 kJ/mol | National Center for Biotechnology Information (NIH) |
Electron configuration
- Noble gas notation
- [Ar] 3d⁸ 4s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸ 4s²
- Electrons per shell
- 2, 8, 16, 2