Question

Which of the following species will have the largest and the smallest size MG,MG2+,AL,AL3+,NA,NA+,LI,LI+

Answer 1

mg2+is largest and na is smallest

Answer 2

→ Atomic radii decrease across a period.

→ Cations are smaller than their parent atoms.

→ Among iso-electronic species, the one with the larger positive nuclear charge will have a smaller radius.

→ Hence, the largest species is Mg ; the smallest one is Li $^{+}$.