question_answer

What is the electronic configuration of \[M{{n}^{2+}}\]?

A)  \[[Ne]\,3{{d}^{5}},4{{s}^{0}}\]

B)  \[[Ar]\,3{{d}^{5}},4{{s}^{2}}\]

C)  \[[Ar]\,3{{d}^{5}},4{{s}^{0}}\]

D)  \[[Ne]\,3{{d}^{5}},4{{s}^{2}}\]

Correct Answer: C

Solution :

Electronic configuration of Mn (25) is                 \[1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{6}},4{{s}^{2}},3{{d}^{5}}\] \[\therefore \] Electronic configuration of Mn21is                       \[1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{6}},3{{d}^{5}}\] \[\because \] \[M{{n}^{2+}}=[Ar]3{{d}^{5}},4{{s}^{0}}\] \[=[Ar]\]