Question

Ground and excited state of atom configuration of iron +2 ion

Answer 1

Iron ground state- 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^6..
Iron +2 state- 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^4...