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Which of the following pairs of elements...

Which of the following pairs of elements would have a more negative electron gain enthalpy?
a. `O` or `F`, b.`F` or `Cl`

Text Solution

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(i) F is more negative electron gain enthalpy than O because it has `2s ^(2) 2p ^(5)` configuration. It has only one electon less than the noble gas configuration. Therefore, it has strong tendency to accept an electron and its electron gain enthalpy is more negative.
(iii) Cl has more negative electron gain enthalpy than F. The less negative electron gain enthalpy of F is due to its very small size which has strong electron - electron repulsions. Therefore, F has less tendency to accept an electron and its electron gain enthalpy is less negative than Cl.
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