(a) $[Ne], 4 p^{2}$
(b) $[Ar], 4 s^{2}$
(c) $[Ne], 4 s^{2}$
(d) $[Kr], 4 p^{2}$
[1992]
Correct Answer: 35.(b)
Solution:
(b) $ _{20} Ca=1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2}=[A r] 4 s^{2}$
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