Question

Write the ground state electron configuration for S^2-, Ca^2+, Cr^3+, and Ni^2+​

Answer 1

The ground state electron configuration for each ion is:

S^2-: 1s^2 2s^2 2p^6 3s^2 3p^6

Ca^2+: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^0

Cr^3+: 1s^2 2s^2 2p^6 3s^2 3p^6 3d^3

Ni^2+: 1s^2 2s^2 2p^6 3s^2 3p^6 3d^8