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$Na^+$, $Mg^{2+}$, $Al^{3+}$, $Si^{4+}$ are isoelectronics. Their ionic size follows the order

• A
  $Na^+ < Mg^{2+} < Al^{3+} < Si^{4+}$
• B
  $Na^+ > Mg^{2+} > Al^{3+} > Si^{4+}$
• ✓
  $Na^+ < Mg^{2+} > Al^{3+} > Si^{4+}$
• D
  $Na^+ > Mg^{2+} < Al^{3+} > Si^{4+}$