Question

Which among the following elements will have a positive electron gain enthalpy?

• A. $B$
• B. $C$
• C. $N$
• D. $O$

Answer 1

The correct option is C $N$

Electron gain enthalpy is defined as the change in energy (in kJ/mol) of an isolated gaseous atom when an electron is added to the outermost shell of the atom to form a negative ion.

Nitrogen has a stable half filled electronic configuration. So, even though it is a non-metal, energy is required for the addition of extra electron i.e, $N$ has a positive electron gain enthalpy.