Question
Chloride ion and potassium ion are isoelectronic. Then
$K = 2,\,8,\,8,\,1$ ${K^ + } = 2,\,8,\,8$
$Cl = 2,\,8,\,7$ $C{l^ - } = 2,\,8,\,8$
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(At. no. : $Sc = 21, Ti = 22, Ni = 28,$$ Cu = 29, Co = 27$)