How many unpaired electrons are present in a ground state gaseous Ni2+ ion?

  1. A

    0

  2. B

    2

  3. C

    4

  4. D

    6

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    Solution:

    The atomic number of Ni is 28. Its electronic configuration is1s22s22p63s23p64s23d8.

    Now, the electronic configuration of  Ni2+(losing two-electron ) is 1s22s22p63s23p63d8

     Ni2+ has 8 electrons in its outermost shell, out of which there are six paired electrons and two unpaired electrons.

    Therefore, the unpaired electrons present in a ground state gaseous   Ni2+ is 2

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