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(a) Define ionization enthalpy. 

(b) Define electron gain enthalpy. What are its units?

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(a) Ionization Enthalpy : The energy required to remove an electron from an isolated gaseous atom in its ground state is called ionization enthalpy. It is represented by ∆iH.

(b) Electron Gain Enthalpy: When an electron is added to a neutral gaseous atom to convert it into a negative ion, the enthalpy change accompanying the process is called electron gain enthalpy. The unit of electron gain enthalpy is kJ/mol.

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