Question

The first ionization potential of $Na$ is $5.1eV$. The value of electron gain enthalpy of $N{a}^{+}$ will be :

• A. $-5.1eV$
• B. $-10.2eV$
• C. $+2.55eV$
• D. $-2.55eV$

Answer 1

The correct option is A $-5.1eV$

The ionization energy of an atom or molecule describes the minimum amount of energy required to remove an electron from the atom or molecule in the gaseous state whereas electron gain enthalpy is the amount of energy released when an isolated gaseous atom accepts an electron to become a monovalent gaseous anion.