Among the following, the set of isoelectronic ions is

Options

A. `Na^(+), Mg^(2+) , F^(-) , Cl^(-)`
B. `Na^(+) , Ca^(2+) , F^(-) , O^(-)`
C. `Na^(+) , Mg^(2+) , F^(-) , O^(2-)`
D. `Na^(+) , K^(+) , S^(2-) , Cl^(-)`

Answer

C

Explanation

Electrons in `Na^(+) = 11 - 1 = 10`
Electrons in `Mg^(2+) = 12 - 2 = 10`
Electrons in `F^(-) = 9 + 1 = 10`
Electrons in `O^(2-) = 8 + 1 + 1 = 10`
Hence ` Na^(+) , Mg^(2+) , F^(-) and O^(2-)` are isoelectronic species.