####62. An ion has 18 electrons in the outermost shell, it is
[1990]
(a) $Cu^{+}$
(b) $Th^{4+}$
(c) $Cs^{+}$
(d) $K^{+}$
thus the electronic configuration of $Cu^{+}$is
$=1 s^{2} 2 s^{2} 2 p^{6} \underbrace{3 s^{2} 3 p^{6} 3 d^{10}} _{18 e^{-}}$
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