Question

what do you understand by electron gain enthalpy and ionization enthalpy

Answer 1

ionisation enthalpy is the heat to change when we take out electron from an atom. or the enthalpy change during the removal of electron from an atom is known as ionisation enthalpy.
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while electron gain enthalpy is the heat change during the gain of an electron. or the enthalpy change during the gain of an electron is known as electron gain enthalpy.
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electron affinity is the tendency to gain electron.