What is isoelectronic series? Name a series that will be isoelectronic with each of the following atom or ions .
(b) `Ar`

Explanation

The species containing same no. of electrons are called iso electronic species and this series is called isoelectronic series
Ar relating series `P^(-3), S^(-2), Cl^(-), Ar, K^(+), Ca^(+2)`