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- #Classification of Elements and Periodicity in Properties
- #NCERT
- #Chemistry
- #CBSE 11 Class
- #Chemistry Part I Textbook for Class XI
3.20 Which of the following pairs of elements would have a more negative electron gain enthalpy?
(i) O or F
Answers (1)
Oxygen and Fluorine both are of the second group elements and as we move from O to F, there is a decrease in atomic size, as a result, there is an increase in nuclear charge. Further, by a gain of one electron, ion has an inert gas configuration and
gives ion which does not have a stable inert gas configuration.
The energy released is much higher in going from fluorine to oxygen or the electron gain enthalpy value of F is much more negative than that of oxygen.
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