Which of the following pairs of elements would have a more negative electron gain enthalpy?

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Detailed Solution

(i) O (Oxygen) or F (Fluorine):

Fluorine (F) has a more negative electron gain enthalpy than oxygen because its atomic size is smaller and its nuclear charge is higher, so it attracts electrons more strongly.

(ii) F (Fluorine) or Cl (Chlorine):

Chlorine (Cl) has a more negative electron gain enthalpy than fluorine. This is because, although fluorine has a higher nuclear charge, its small size leads to increased electron-electron repulsion, making electron acceptance less favorable. Chlorine’s larger atomic size reduces this repulsion.

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