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What is the electronic configuration of Cu2+ (Z= 29) of least position:
(1) [Ar]4s1 3d8
(2) [Ar]4s2, 3d10 4p1
(3) [Ar]4s1 3d10
(4) [Ar]3s9
Ans: [Ar]3s9
An ion has 18 electrons in the outermost shell, it is: (1) Cu + (2) Th 4+ (3) Cs + (4) K + Ans
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