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Which of the following elements have the most negative electron gain enthalpies corresponding to the largest release of enegry?A. Group `2` elementsB. Group`16`elementsC. Group `17`elementsD. Group`18`elements

Answer» Correct Answer - C
Halogen atoms, which have the oueter electron configuration `ns^(2)np^(5)`, have the most negative electron gain enthalpies because by gaining one extra electron, they form stable anions with noble gas configuration,…. `ns^(2)np^(6)`. Group `2` and group `18` elements on account of stable configuration have positive electron gain enthalpies corresponding to an absorption of energy.


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