Question

The compound in which cation is isoelectronic with anion is:

• A. $NaCl$
• B. $CsF$
• C. $NaI$
• D. $K_{2}S$

Answer 1

The correct option is D $K_{2}S$

Option D

$K_{2}5$

$K^{+}1$ $S^{2-}$

No. of electron in $K^{+}=19-1=18$

No. of electron in $S^{2-}=16+2=18$.