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Question

Chemistry Question on Classification of elements & periodicity in properties

What is the value of electron gain enthalpy of Na+Na^+ if IE1IE_1 of Na=5.1 eVNa = 5.1 \, eV?

A

+ 10.2 eV

B

-5.1 eV

C

-10.2 eV

D

+ 2.55 eV

Answer

-5.1 eV

Explanation

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.