`Mg^(2+)` is isoelectronic with

Options

A. `Cu^(2+)`
B. `Zn^(2+)`
C. `Na^(+)`
D. `Ca^(2+)`

Answer

C

Explanation

`Mg^(2+)` electronic configuration : `1 s^(2) 2s^(2) 2p^(6)`.
`Na^(+)` electronic configuration : `1 s^(2) 2s^(2) 2p^(6)` as both posses same number of electrons i.e. isoelectronic effect.