A) \[\text{ }\!\![\!\!\text{ }Ar\text{ }\!\!]\!\!\text{ }3{{d}^{4}}4{{s}^{2}}\]
B) \[\text{ }\!\![\!\!\text{ }Ar\text{ }\!\!]\!\!\text{ }3{{d}^{3}}4{{s}^{0}}\]
C) \[\text{ }\!\![\!\!\text{ }Ar\text{ }\!\!]\!\!\text{ }3{{d}^{2}}4{{s}^{1}}\]
D) \[\text{ }\!\![\!\!\text{ }Ar\text{ }\!\!]\!\!\text{ }3{{d}^{5}}4{{s}^{1}}\]
Correct Answer: B
Solution :
\[Cr(24):[Ar]3{{d}^{5}}4{{s}^{1}}\] \[C{{r}^{3+}}:[Ar]3{{d}^{3}}4{{s}^{0}}\]
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