Question

Which of the following element has highest electron-gain enthalpy?

• A. Oxygen
• B. Fluorine
• C. Chlorine
• D. Neon

Answer 1

The correct option is C Chlorine

Halogens have the highest electron gain enthalpy (electron affinity). Normally electron affinity decreases as we move down the group. However, fluorine has a lower value than chlorine which is due to its small size. Hence, chlorine has the highest electron gain enthalpy.

Hence, the correct option is $\text{C}$