A) \[[Ar]\text{ }3{{d}^{4}}\text{ }4{{s}^{2}}\]
B) \[[Ar]\text{ }3{{d}^{3}}\text{ }4{{s}^{0}}\]
C) \[[Ar]\text{ }3{{d}^{2}}\text{ }4{{s}^{1}}\]
D) \[[Ar]\text{ }3{{d}^{5}}\text{ }4{{s}^{1}}\]
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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