 The homolytic bond dissociation energies, usually abbreviated as "Δ"H"°" are a measure of bond strength.Splitting H2 into 2H•, for example, requires a Δ"H"° of +435 kJ·mol, while splitting Cl2 into two Cl• requires a Δ"H"° of +243 kJ·mol.For weak bonds, homolysis can be induced thermally.