Which of the following species will have the largest and the smallest

1.	Which of the following species will have the largest and the smallest size Mg, Mg^(2+), Al, Al^(3+)?.
Answer» Solution :Atomic radii decrease across a period. Cations are smaller than their parent atoms. AMONG isoelectronic ions, the one with the large positive nuclear charge will have a smaller radius. Hence the largest species is Mg, the smallest one is `Al^(3+)`The SIZE of an ANION greater while that of the cation is smaller than that of its parent ATOM, e.g. `F^(-) = (1.36 Å) gt F (= 0.72 Å) , CL^(-) (=1.81 Å) gt Cl (=0.99 Å) , Na^(+) =(0.95 Å) lt Na (=1.90 Å) , Ca^(2+) (=0.99 Å) lt Ca(=1.97Å)`

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