question_answer

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

A) \[~[Ne]\text{ }3{{d}^{5}},\text{ }4{{s}^{o}}\]

B)        \[\text{ }\!\![\!\!\text{ }Ar\text{ }\!\!]\!\!\text{  }3{{d}^{5}},\text{ }4{{s}^{2}}\]

C) \[\text{ }\!\![\!\!\text{ }Ar\text{ }\!\!]\!\!\text{  }3{{d}^{5}},\text{ }4{{s}^{0}}\]   

D)       \[\text{ }\!\![\!\!\text{ }Ne\text{ }\!\!]\!\!\text{  }3{{d}^{5}},\text{ }4{{s}^{2}}\]

Correct Answer: C

Solution :

Electronic configuration of \[Mn(25)\]is \[1{{s}^{2}},\text{ }2{{s}^{2}},\text{ }2{{p}^{6}},\text{ }3{{s}^{2}},\text{ }3{{p}^{6}},\text{ }4{{s}^{2}},\text{ }3{{d}^{5}}\] \[\therefore \]Electronic configuration of Mn24-is                 \[1{{s}^{2}},\text{ }2{{s}^{2}},\text{ }2{{p}^{6}},\text{ }3{{s}^{2}},\text{ }3{{p}^{6}},\text{ }3{{d}^{5}}\]                 \[\because \]     \[M{{n}^{2+}}=[Ar]3{{d}^{5}},4{{s}^{0}}\]