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 \[N{{i}^{2+}}\] cation  (atomic number = 28)                                            [IIT 1981; MNR 1984; MP PMT 1995; Kerala PMT 2003]

    A)                 0             

    B)                 2

    C)                 4             

    D)                 6

    Correct Answer: B

    Solution :

               Two unpaired electrons are present in            \[N{{i}^{++}}(z=28)\] cation            \[Ni_{28}^{++}=[Ar]\]

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