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An ion has 18 electrons in the outermost...

An ion has 18 electrons in the outermost shell it is

A

`Cu^(+)`

B

`Th^(4+)`

C

`Cs^(+)`

D

`K^(+)`

Text Solution

Verified by Experts

The correct Answer is:
A
An ion has 18 electrons in the outermost shell, that means in the ground state it has 18 electrons in the penultimate shell.
`""_(29)Cu=1s^(2),2s^(2)2p^(6),3s^(2)3p^(6)3d^(10),4s^(1)`
`Cu^(+)=[Ar]`.
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