Answer:
Mg and Al, both belong to same
period.
Mg Al
Atomic
number 12 ; 13
Atomic size
decreases from left to right across the period. Thus, Mg atom is larger in size
than Al atom.
Cation is smaller than its neutral atom. \[M{{g}^{2+}}\] ion
is smaller than Mg atom and \[A{{l}^{3+}}\] ion is Smaller than Al atom. Thus, \[A{{l}^{3+}}\]
ion size is the smallest and Mg atom is the largest in size among the given
species.
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