question_answer

How many unpaired electrons are present in cobalt [Co] metal                                  [RPMT 2002]

A)                 2             

B)                 3

C)                 4             

D)                 7

Correct Answer: B

Solution :

           \[C{{o}_{27}}=[Ar]\,\,3{{d}^{7}}4{{s}^{2}}\] 3 unpaired electron are present in cobalt metal.