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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)
    Electroh gain enthalpy depends upon the electron affinity of the atom
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Why is the electron gain enthalpy of O or F less than that of S or Cl?...
There is more repulsion for the incoming electron when the size of atom is smaller.
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Most Upvoted Answer
Why is the electron gain enthalpy of O or F less than that of S or Cl?...
Explanation:

Effect of Electron Addition:
- When an electron is added to an atom, it enters a specific energy level or shell.
- In the case of O or F, the electron goes to the n=2 level, which is smaller compared to the n=3 level of S or Cl.

Electron Repulsion:
- The electron being added to O or F in the smaller n=2 level experiences more repulsion from the existing electrons in the same level.
- This increased repulsion leads to a higher energy requirement for adding an electron to O or F compared to S or Cl.

Electronegativity:
- While O and F are indeed more electronegative than S and Cl, this factor alone does not solely explain the difference in electron gain enthalpy.
- The main reason lies in the increased repulsion faced by the electron being added to the smaller n=2 level in O or F.
Therefore, the electron gain enthalpy of O or F is less than that of S or Cl because 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 a larger level (n = 3).
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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 Clb)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-orbitald)Electroh gain enthalpy depends upon the electron affinity of the atomCorrect answer is option 'B'. Can you explain this answer?
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