Nickel
Transition Metal
Nickel (Ni) is a chemical element with atomic number 28, classified as a transition metal. At room temperature it is a solid. It was discovered in 1751 by Axel Fredrik Cronstedt.
Properties
- Atomic number
- 28
- Atomic mass
- 58.693 u
- Category
- Transition Metal
- Group
- 10
- Period
- 4
- Block
- d-block
- Electron configuration
- [Ar] 3d⁸ 4s²
- Phase at STP
- Solid
- Density
- 8.912 g/cm³
- Melting point
- 1728 K (1454.8 °C)
- Boiling point
- 3186 K (2912.8 °C)
- Electronegativity
- 1.91
- Atomic radius
- 149 pm
- Ionization energy
- 7.64 eV
- Discovery
- 1751 · Axel Fredrik Cronstedt
Common uses
Coins, stainless steel, magnets, catalysts
Did you know?
U.S. nickels are only 25% nickel - the rest is copper.