Ionisation enthalpy of an atom is equal to :-
1. Electron gain enthalpy of the cation.
2. Electronegativity of the ion.
3. Ionisation enthalpy of the cation.
4. Electron gain enthalpy of anion.

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Solution

B.Electronegativity of the ion.

Explanation:

Some amount of energy is required in order to remove an electron from atom which will result in formation of + ion. The equal amount of energy will be released if the same electron is added back to the ion, which will be called electron gain enthalpy of ion.

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