Question

Among $N^{-3}$ $O^{-2} , F^{-} , Na^{+}, Mg^{+2} Al^{3+}$
a) What is common in them?
b) Arrange them in the increasing ionic radii.

Answer 1

No. Of electrons is same

N3-. O2-. F-. Na+. Mg2+. Al3+