Why is the electron gain enthalpy of O or F less than that of S or Cl?

Chemistry · Class 11 · CBSE — Classification of Elements and Periodicity in Properties

1. O and F are more electronegative than S and Cl.
2. When an electron is added to O or F, it goes to a smaller (n = 2) level and suffers more repulsion than the electron in S or Cl in larger level (n = 3).
3. Adding an electron to 3p-orbital leads to more repulsion than 2p-orbital.
4. Electron gain enthalpy depends upon the electron affinity of the atom.

Answer

(B) When an electron is added to O or F, it goes to a smaller ( n = 2) level and suffers more repulsion than the electron in S or Cl in larger level ( n = 3).

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