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  4. Which of the following has largest negative electron gain enthalpy?

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Q. Which of the following has largest negative electron gain enthalpy?

JamiaJamia 2010

Solution:

Halogens have highest electron gain enthalpy and its value decreases down the group because size of halogen atom increases. However, chlorine has the highest electron gain enthalpy among halogens because the electrons already present in fluorine atom exerts a repulsive force on the electron being added. Hence, the amount of energy released becomes less than chlorine. The correct order of negative electron gain enthalpy is $ Cl>F>Br>I $