Question

give an example each for anion and cation isoelectronic with sulphide ion

Answer 1

Explanation:

The S2- ion is isoelectronic with the Ar atom. It requires less energy to remove an electron from a sulfide ion than from an argon atom.

A valence electron in the sulfide ion is less attracted to the nucleus (charge +16) than is a valence electron in the argon atom (charge +18).