What are iso electronic species? How are their sizes vary in iso electronic series

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Solution

Isoelectronic Species are those atoms or ions which have the same number of electrons.
The variation of size in given isoelectronic series N³^- $>$ O²^- $>$ F^{- $>$}Ne $>$ Na⁺ $>$ Mg²⁺ $>$ Al³⁺
All the member have 10 electrons but different number of protons. Size of the species decreases with increasing protons.
aThe N has minimum 7 protons and Al has maximum 13 protons so N³^- is largest and Al³⁺ is smallest.

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