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An ion that has 18 electrons in the oute...

An ion that has 18 electrons in the outermost shell is

A

`Cu^(+)`

B

`Th^(4+)`

C

`Cs^(+)`

D

`K^(+)`

Text Solution

Verified by Experts

The correct Answer is:
A
Atomic number of Cu = 29
Electronic configuration of Cu is `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(1)`
Electronic configuration of `Cu^(2+)` is `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)`
Thus, outermost shell contains 18 electrons.
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