Question

The ions \( \text{O}^{2-} \), \( \text{F}^- \), \( \text{Na}^+ \), \( \text{Mg}^{2+} \) and \( \text{Al}^{3+} \) are isoelectronic. Their ionic radii show:

• A. A decrease from \( \text{O}^{2-} \) to \( \text{F}^- \) and then increase from \( \text{Na}^+ \) to \( \text{Al}^{3+} \)
• B. A significant increase from \( \text{O}^{2-} \) to \( \text{F}^- \)
• C. A significant decrease from \( \text{O}^{2-} \) to \( \text{Al}^{3+} \)
• D. An increase from \( \text{O}^{2-} \) to \( \text{F}^- \) and then decrease from \( \text{Na}^+ \) to \( \text{Al}^{3+} \)

Hint:

For isoelectronic ions, the ionic radius decreases with increasing nuclear charge due to stronger attraction of electrons by the nucleus.

Answer 1

The Correct Option is C