The bond enthalpy is the highest for — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Bond enthalpy is the amount of heat energy required to break one mole of molecules. The bond enthalpy of a molecule decreases down the group due to an increase in atomic size as the force of attraction decreases and increases from left to right in periods due to decreases in size. But in fluorine, due to its very small size, it exhibits very high interatomic repulsions. And the order of bond enthalpy order is as follows- 2 2 2 2 H > Cl > Br > F .