Question

$I{I}^{nd}$ ionisation potential of which of the element is maximum?

• A. Lithium
• B. Oxygen
• C. Nitrogen
• D. Fluorine

Answer 1

The correct option is A Lithium

Because after removal of $1^{st}$ $e^{-}$ $Li$ acquires stable full filled electronic configuration, i.e, $L{i}^{+}⟶1s^2$. To remove an $e^{-}$ from this $s-$ orbital is very difficult, as it is very near to nucleus and is strongly attracted towards the nucleus.