Question

In which of the following species cation and anion have the same number of electrons?

• A. $CaO$
• B. $KBr$
• C. $NaF$
• D. $MgS$

Answer 1

The correct option is C $NaF$

In the $NaF,$ $N{a}^{+}$ is the cation, and $F^{-}$ is the anion. In ionic form, $Na$ has $10e^{-}$ and $F$ also have $10e^{-}$.

The case like option C is not obeyed in any other options where the number of electrons in cation and anion is the same.