Home Chemistry Classification of Elements and Periodicity Ionisation Energy Why is the electron gain enthalpy of O or F …
Chemistry Classification of Elements and Periodicity Ionisation Energy Single Correct MCQ
Published on: August 14, 2026

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

A
O and F are more electronegative than S and Cl.
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).
C
Adding an electron to 3p – orbital leads to more repulsion than 2P – orbital.
D
Electron gain enthalpy depends upon the electron affinity of the atom.

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The correct answer is:
B

there is more repulsion for the incoming electron when the size of atom is smaller.

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