Unlike xenon, helium does not form any chemical compound. Explain.

Explanation

Helium has no d-orbitals in the valence shell and hence electrons cannot be promoted to higher energy levels like that in Xe to form bonds. Again, the ionization enthalpy of He is much higher `(2372 kJ.mol^(-1))` than that of Xe `(1170 kJ.mol^(-1))` and oxygen `(1175kJcdotmol^(-1))`. For these reasons, unlike xenon, helium does not form any chemical compounds.