Electronic configuration of nickel

Electrons in each shell

Nickel has 28 electrons arranged as 2, 8, 16, 2 across 4 shells, which is why it sits in period 4.

How to write it

Electrons fill orbitals in order of increasing energy: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p… Each s orbital holds 2 electrons, p holds 6 and d holds 10. Placing Nickel's 28 electrons in that order gives 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸.

Nickel at a glance

Other elements in group 10