The first (deltai H1) and second (deltai H2) ionisation enthalpies (in kJ/mol) and the electron gain enthalpy (deltaeg H) (in kJ/mol) of the elements I, II, III, IV and V are given below II III IV and V are given below The first (deltai Hi) and second (deltai H2) ionisation enthalpies (in kJ/mol) and the [...]