What is isoelectronic series? Name a series that will be isoelectronic with each of the following atom or ions .
(d) `Rb^(+)`

Explanation

The species containing same no. of electrons are called iso electronic species and this series is called isoelectronic series
`Rb^(+)` relating series `As^(-3), Se^(-2), Br^(-), Kr, Rb^(+), Sr^(+2)`