• # question_answer 5) Which of the following species will have the largest and smallest size? $Mg,M{{g}^{2+}},Al,A{{l}^{3+}}$

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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