What are isoelectronic species ?

Explanation

The neutral atoms or ions of different elements having same number of electrons are called as isoelectronic species.
For example, `F^(-)=(1s^(2)2s^(2)2p^(6))`
`Na^(+)=(1s^(2)2s^(2)2p^(6))`
`Ne=(1s^(2)2s^(2)2p^(6))`
`F^(-1),Na^(+),Ne` are iso-electronic species. They have same number of electrons (10 electrons each).