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Electronic configuration of Sc21 is:
(1) 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d1
(2) 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d2
(3)1s2, 2s2, 2p6, 3s2, 3p6, 4s0, 3d3
(4) 1s2, 2s2, 2p6, 3s2, 3p2, 4s2, 3d2
Ans: 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d1
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