Nickel

Element 28 on the periodic table, symbol Ni, group 10, period 4.

Nickel is a chemical element with symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel belongs to the transition metals and is hard and ductile.

Appearance: lustrous, metallic, and silver with a gold tinge

Properties

Atomic Number: 28
Atomic Mass: 58.6934 u
Group: 10
Period: 4
Block: d-block
Category: Transition Metal
State at 25 °C: Solid
Melting Point: 1,728 K · 1,454.9 °C
Boiling Point: 3,003 K · 2,729.9 °C
Density: 8.908 g/cm³
Atomic Radius: 135 pm
Electronegativity: 1.91
Oxidation States: +2
Abundance in Crust: 84 mg/kg
Discovered: 1751
Discovered By: Axel Fredrik Cronstedt

Electron Configuration

[Ar] 3d8 4s2

1s2 2s2 2p6 3s2 3p6 4s2 3d8

Ionisation Energies (kJ/mol)

1. 737.1
2. 1,753
3. 3,395
4. 5,300
5. 7,339
6. 10,400
7. 12,800
8. 15,600

Elements near Nickel

Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.