JEE Main & Advanced Chemistry Structure of Atom Question Bank Quantum number, Electronic configuration and Shape of orbitals

  • 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.

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