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  4. Which one of the following elements has the highest negative value for its electron gain enthalpy?

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Q. Which one of the following elements has the highest negative value for its electron gain enthalpy?

J & K CETJ & K CET 2016Classification of Elements and Periodicity in Properties

Solution:

The elements of group $16$ have relatively high negative electron gain enthalpy values which decrease down the group from $S$ to Po. Oxygen has lowest negative electron gain enthalpy due to its small size which makes electron density high and repels the incoming electron