Question

13. Arrange the following in the order of increasing radii:
(a) I, i-, I+(b) 0,P, N.​

Answer 1

Answer:

Explanation:

12Mg-3<11Na+<9F-<8O-2<7N-3

Explanation:

If the ions derived from different atoms are isoelectronic species, then they all have same number of electrons in their electronic shells and will have got same electronic configuration but their nuclear charge will differ because of their difference in number of protons in the nucleus. With increase in number of protons in the nucleus the electrons are more attracted towards nucleus thereby causing the decrease in ionic radius. On this principle our problem will be solved

The given ions are

   7N-3→no. of proton=7and no of electron=10

   8O-2→no. of proton=8and no of electron=10

   9F-→no. of proton=9and no of electron=10

   11Na+→no. of proton=11and no of electron=10

   12Mg-3→no. of proton=12and no of electron=10

Hence the increasing order of ionic radius is

12Mg-3<11Na+<9F-<8O-2<7N-3