Grade 6Algebra
An ion has 18 electrons in the outermost shell, it is(a) Cu+(b) Th4+(c) Cs+(d) K+
An ion has 18 electrons in the outermost shell, it is
(a) Cu+
(b) Th4+
(c) Cs+
(d) K+
1 Answer
Jitender Pal
(a) Cu+ = 29 – 1 = 28 e-
Thus the electronic configuration of Cu+ is
Cu+ (28) = 1s2 2s2
2p6 
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