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  4. What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?

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Q. What is the value of electron gain enthalpy of $Na^+$ if $IE_1$ of $Na = 5.1 \, eV$?

AIPMTAIPMT 2011Classification of Elements and Periodicity in Properties

Solution:

The electron gain enthalpy of sodium cation is equal in magnitude and opposite in sign to the first ionization energy of sodium atom. It is equal to −5.1eV.