Which of the following is not iso-electronic pair?

Options

A. `Mg^(2),C^(4-)`
B. `N^(3),O^(2-)`
C. `N^(2),O^(2-)`
D. `F^(-),Al^(3+)`

Answer

c

Explanation

Isoe,ectronic ions should have same number of electrons.
`N^(-2)(7+2=9) and O^(-2) (8+2=10)` ions do not havesame numbers of electrons.Thus `N^(-2)` and `O^(-2)` is not isoelectronic pair.