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

An ion has 18 electrons in the outermost shell, it is
(a) Cu+
(b) Th4+
(c) Cs+
(d) K+

Grade:6

1 Answers

Jitender Pal
askIITians Faculty 365 Points
9 years ago

(a) Cu+ = 29 – 1 = 28 e-

Thus the electronic configuration of Cu+ is

Cu+ (28) = 1s2 2s2 2p6


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