Why ZnCl is least ionic

ZnCl is least ionic because of the size of Zn atom.
Zn lies at the end of D-Block i.e 12th group. So as we know , the size decreases as we go across the period. Therefore, Zn has small size.
In line with Fajan's rule, which states that an ionic compound will have more covalent character if size of cation is small and anion is large.

This holds true for ZnCl due to small size of Zn (cation) which is why it has more covalent character i.e least ionic character

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because it has more charge density per unit volume and therefore by FAJAN?s rule it is most covalent and least ionic
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