Question

The correct order of radii is

• A. $F^{3+}<F{e}^{2+}<F{e}^{4+}$
• B. $Na<Li<K$
• C. $F^{-}<O^{2-}<N^{3-}$
• D. $N<Be<B$

Answer 1

The correct option is C $F^{-}<O^{2-}<N^{3-}$

Among isoelectric species, greater the negative charge, greater the ionic size, Hence $F^{-}<O^{2-}<N^{3-}$