Question

Which of the following order of ionic radii is correctly represented?

• A. \( H^- > H^+ > H \)
• B. \( Na^+ > F^- > O^{2-} \)
• C. \( F^- > O^{2-} > Na^+ \)
• D. \( Al^{3+} < Mg^{2+} < N^{3-} \)

Hint:

The ionic radius decreases with increasing positive charge and increases with increasing negative charge for ions with the same electron configuration.

Answer 1

The Correct Option is D

The ionic radius decreases as the charge on the ion increases for ions with the same electron configuration. The correct order is: - \( Al^{3+} \) has the smallest ionic radius due to its 3+ charge, followed by \( Mg^{2+} \) (2+ charge), and then \( N^{3-} \) (3- charge), which has the largest radius due to its negative charge. Therefore, the correct order is \( Al^{3+} < Mg^{2+} < N^{3-} \).