What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions.
$(i)$ $F^{-}$
$(ii)$ $Ar$
$(iii)$ $Mg^{2+}$
$(iv)$ $Rb^{+}$
$(i)$ $F^{-}$
$(ii)$ $Ar$
$(iii)$ $Mg^{2+}$
$(iv)$ $Rb^{+}$
(N/A) Isoelectronic species are atoms or ions that contain the same number of electrons.
For example,$O^{2-}, F^{-}, Na^{+}, Mg^{2+}$ all have $10$ electrons and are isoelectronic.
For example,$O^{2-}, F^{-}, Na^{+}, Mg^{2+}$ all have $10$ electrons and are isoelectronic.
| Ion and number of electrons | Isoelectronic species |
| $(i)$ $F^{-} (10)$ | $O^{2-}$ |
| $(ii)$ $Ar (18)$ | $Cl^{-}$ |
| $(iii)$ $Mg^{2+} (10)$ | $Na^{+}$ |
| $(iv)$ $Rb^{+} (36)$ | $Kr$ |
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