PIMSO 2025 - Science - Secondary 1 - National Round Question 11

Question 11

The following species have the same electronic configuration. Which of them has the biggest radius? (Shown below is the Periodic Table for reference.)

Question illustration

$\mathrm{O}^{2-}$
$\mathrm{F}^{-}$
$\mathrm{Ne}$
$\mathrm{Na}^{+}$