Question

Which of the following has the maximum size?

• A. \( \text{Al}^{3+} \)
• B. \( \text{Mg}^{2+} \)
• C. \( \text{F}^{-} \)
• D. \( \text{Na}^{+} \)

Hint:

In general, cations are smaller than their neutral atoms, and anions are larger due to the extra electron-electron repulsion.

Answer 1

The Correct Option is C

Among the given ions, \( \text{F}^{-} \) has the largest size because it is an anion with a greater number of electrons than protons, causing the electron cloud to expand. \( \text{Na}^{+} \), \( \text{Mg}^{2+} \), and \( \text{Al}^{3+} \) are cations, and the higher the charge, the smaller the ionic radius due to increased attraction between the nucleus and electrons.