A) 21
B) 19
C) 24
D) 22
Correct Answer: D
Solution :
When element is in \[{{M}^{3+}}\] form, its electronic configuration is \[[Ar]\,4{{s}^{1}},\]hence, electronic configuration of M will be \[[Ar]\,4{{s}^{2}}3{{d}^{2}}.\] Hence, atomic number of element (M) = 18 + 4 = 22.You need to login to perform this action.
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