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The minimum amount of energy required to remove the most loosely bound electron from an isolated, neutral gaseous atom of an element in its ground state is called ionization enthalpy.
when an electron is added to an isolated,neutral,gaseous atom of an element to form a gaseous negative ion, the enthalpy change is called the electron gain enthalpy of the element.
Enthalpy is the energy involved in the formation/breaking of chemical bonds in a particular reaction.
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