Which one of the following arrangements represents the correct order of electron gain enthalpy of the given atomic species?A. `Cl lt F lt O lt S`B. `O lt S lt F lt Cl`C. `F lt S lt O lt Cl `D. `S lt O lt Cl lt F`

Which one of the following arrangements represents the correct order o

1.	Which one of the following arrangements represents the correct order of electron gain enthalpy of the given atomic species?A. `Cl lt F lt O lt S`B. `O lt S lt F lt Cl`C. `F lt S lt O lt Cl `D. `S lt O lt Cl lt F`
Answer» Correct Answer - B Key Idea Electron gain enthalpy, generally, increases in a period from left to right and decreases in a group on moving downwards. However, members of III period have somewhat higher electron gain enthalpy as compared to the corresponding members of second period, because of their small size. 0 and S belong to VI A (16) group and Cl and F belong to VII A (17) group. Thus, the electron gam enthalpy of Cl and F is higher as compared to 0 and S. `Cl and F gt 0 and S ` Between Cl and F, Cl has higher electrons gain enthaply then the F, since the incoming electron experience a greater force of repulsion because of small size of F-atom. Similar is true in case of O and S, i.e. the electron gain enthalpy of is higher as compared to O due to its small size. Thus, the correct order of electron gain enthalpy of given elements is `O lt S lt F lt Cl`

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Which one of the following arrangements represents the correct order of electron gain enthalpy of the given atomic species?A. `Cl lt F lt O lt S`B. `O lt S lt F lt Cl`C. `F lt S lt O lt Cl `D. `S lt O lt Cl lt F`

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