An ion has 18 electrons in the outermost shell, it is (a) \( \mathr...

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An ion has 18 electrons in the outermost shell, it is
(a) \( \mathrm{Cu}^{+} \)
(b) \( \mathrm{Th}^{4+} \)
(c) \( \mathrm{Cs}^{+} \)
(d) \( \mathrm{K}^{+} \)
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