A group of ions are given belowNa oa My FN' Br(a) Two of the above ions and it iso electronic Identity them,(b) Arrange the given iso electronic species in the order of increasing ionic radi​

As we move along a period, size decreases and as we move down the group size increases so here

Z electron

Na+ 11 10

Mg2+ 12           10

Al+3 13 10

F− 9 10

Above are isoelectronic species, hence size ∝Z1​

So size decreases from O−2 to Al+3