1.

Al^(3+) has a lower radius than Mg^(2+) ion because

Answer»

Mg atom has less number of neutron than Al
`Al^(3+)` has higher nuclear CHARGE than `Mg^(2+)`
their electronegatives are different
Al has a lower IONIZATION potential than Mg atom.

Solution :`Al^(3+)` has a higher nuclear charge `(+13)` than `Mg^(2+) (+12)`.


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