[Orissa JEE 2005]
A) $ 4s^{o}3d^{4} $
B) $ 4s^{2}3d^{2} $
C) $ 4s^{2}3d^{0} $
D) $ 3p^{6}4s^{2} $
Correct Answer: A
Electronic configuration of chromium $ Cr\to [Ar],3d^{5}4s^{1} $
$ C{{r}^{2+}}\to [Ar]3d^{4}4s^{0} $ .
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