Q. 47

Hydrogen generally forms covalent compounds. Give reason.

Answer :

Hydrogen has only one electron in its valence shell. So it can either lose that electron to form H+ or it can gain one electron to attain the noble gas configuration of Helium. So, it can form compounds with both covalent and ionic bonds.

But, the ionisation enthalpy of H is very high and electron gain enthalpy is slightly negative. Therefore, ionic bonds are not preferred, instead H likes to form compounds with covalent bonding.

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