A) 25
B) 26
C) 22
D) 19
Correct Answer: A
Solution :
Given, \[X=[Ar]{{d}^{4}}\] \[\therefore \] The complete configuration of the ion, \[{{X}^{3+}}=1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}}3{{p}^{6}},3{{d}^{4}}\] \[\therefore \] \[X=1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{6}},3{{d}^{5}}4{{s}^{2}}\] \[\therefore \]The atomic number of the element is 25 and the element is Mn.
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