Consider the ionization enthalpies of Lithium, Hydrogen, and Fluorine. Which of the following statem — Hydrogen Chemistry Question

💡 Solution & Explanation

Hydrogen has a uniquely high ionization enthalpy ($1312\text{ kJ mol}^{-1}$) compared to alkali metals (e.g., Li is $520\text{ kJ mol}^{-1}$), making its resemblance to Group 1 imperfect. While closer to halogens (F is $1680\text{ kJ mol}^{-1}$), $H_2$ lacks the lone pairs present in $F_2$, $Cl_2$, etc., justifying its unique, independent placement.