A) $ 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{1} $
B) $ 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{2} $
C) $ 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{0}3d^{3} $
D) $ 1s^{2}2s^{2}2p^{6}3s^{2}3p^{2}4s^{2}3d^{2} $
Correct Answer: A
According to Aufbau-s rule.
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