The electronic configuration of calcium ion ( Ca2+) is:
(1) 1s1, 2s2, 2p6, 3s2, 3p6, 4s2
(2) 1s1, 2s2, sp6, 3s2, 3p6, 4s1
(3) 1s1, 2s2, 2p6, 3s2, 3p6, 3d2
(4) 1s1, 2s2, sp6, 3s2, 3p6, 3d5
(5) 1s1, 2s2, 2p6, 3s2, 3p6, 4s0
Ans:1s1, 2s2, 2p6, 3s2, 3p6, 4s0