Which of the following species will have the largest and smallest size? Mg, Mg2+, Al, Al3+
Mg>Al>Mg+2>Al+3 as left to right size decrease and zeff. Of Mg+2 is lower so size is greater than Al+3
Largest Mg ......
Smallest Al +3
Mg. ; Al
12. ; 13
Atomic size decreases from left to right in a period.
Thus, Mg atom is larger than Al atom.
Cation is smaller than neutral atom. Mg2+ ion is smaller than Mg atom and Al3+ is smaller than Al atom.
Thus, Al3+ is smallest and Mg atom is largest in size among the given species.