A) \[4s{}^\circ \,3{{d}^{4}}\]
B) \[4{{s}^{2}}\,3{{d}^{2}}\]
C) \[4{{s}^{2}}\,3{{d}^{0}}\]
D) \[4{{p}^{6}}\,4{{s}^{2}}\]
Correct Answer: A
Solution :
Electronic configuration of chromium \[Cr\to \left[ Ar \right]\,3{{d}^{5}}\,4{{s}^{1}}\] \[C{{r}^{2+}}\to \left[ Ar \right]\,3{{d}^{4}}\,4{{s}^{0}}\]
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