Question

___ has the highest value of electron gain enthalpy.

• A. Chlorine
• B. Sodium
• C. Sulphur
• D. Argon

Answer 1

The correct option is A

Chlorine

As the nuclear charge increases by moving from left to right due to the increase in atomic number, the electron affinity or electron gain enthalpy also increases. Chlorine has the highest electron gain enthalpy as well as its octet is also not filled like argon.