Question

Write electron configuration for the following ions:
(i) Fe3+
(ii) Cr3+
(iii) Pb2+
(iv) Pb
4+
(v) O2

Answer 1

(1)1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^3
2) 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2
3) [xe] 4f^14 5d^10 6s^2
4) [xe] 4f^14 5d^10
5) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 5s2