Question

Which one of the following pairs of elements would have higher electron affinity? Explain
1) N or O
2) F or Cl

Answer 1

Answer:

i. Electron gain enthalpy depends on the size of element. Smaller the size, more negative would be the electron gain enthalpy. F is of smaller size than O thus electron gain enthalpy of F is more negative than O.

ii. Cl is larger in size as compare to Cl, still electron gain enthalpy of Cl is more negative than that of F, This is due to the fact that F is very small in size due to which interelectronic repulsion takes place and the incoming electron does not feel so much attraction.

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