1.

The number of d-electrons in Ni (at. no.= 28) is equal to that of the

Answer»

p ELECTRONS in `F^(-)`
p electrons in Ar
d electrons in `Ni^(2+)`
total electrons in N.

Solution :Electronic configuration of
`""_(28)Ni=1s^(2) 2S^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(8) 4S^(2)`
`NI^(2+)=1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(8)`
Thus, d-electrons in Ni and `Ni^(2+)` are same.


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