Atomic number 28
Nickel
Transition metal
Quick facts
- Atomic mass
- 58.693
- Group
- 10
- Period
- 4
- State (STP)
- solid
- Electronegativity
- 1.91
- Common ox. states
- +2
Properties
Electron configuration
[Ar] 3d⁸ 4s²
- Ionization energy
- 737.1 kJ/mol
- Electron affinity
- 112.0 kJ/mol
- Melting point
- 1728.00 K (1454.8 °C)
- Boiling point
- 3186.00 K (2912.8 °C)
How it bonds
Nickel almost always shows the +2 state — Ni²⁺ in water is bright green. Used to plate steel for corrosion resistance and as a hydrogenation catalyst (Ni catalyses H₂ addition to vegetable oils).