Question:
Which of the following has the least negative electron gain enthalpy?
Which of the following has the least negative electron gain enthalpy?
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Electron gain enthalpy becomes more negative when an atom has a greater tendency to accept an electron. Chlorine has more negative electron gain enthalpy than fluorine due to lower inter-electronic repulsion.
Updated On: Jun 19, 2026
- Oxygen
- Fluorine
- Chlorine
- Sulphur
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The Correct Option is A
Solution and Explanation
Step 1: Understand electron gain enthalpy (EGE).
Electron gain enthalpy is the energy change when an atom gains an electron. More negative value → atom more eager to gain electron.
Step 2: Compare halogens and chalcogens.
Fluorine and chlorine are highly electronegative → highly negative EGE. Oxygen is less negative than fluorine and chlorine.
Step 3: Atomic size effect.
Oxygen is smaller → electron-electron repulsion in the added electron reduces negativity compared to larger atoms.
Step 4: Electronegativity trend.
Electronegativity increases across period → higher electron affinity. Oxygen less negative than F or Cl.
Step 5: Cross-check.
Sulphur (larger than oxygen) has more negative EGE than oxygen → oxygen is least negative.
Step 6: Conclusion.
Thus, oxygen has the least negative electron gain enthalpy.
Electron gain enthalpy is the energy change when an atom gains an electron. More negative value → atom more eager to gain electron.
Step 2: Compare halogens and chalcogens.
Fluorine and chlorine are highly electronegative → highly negative EGE. Oxygen is less negative than fluorine and chlorine.
Step 3: Atomic size effect.
Oxygen is smaller → electron-electron repulsion in the added electron reduces negativity compared to larger atoms.
Step 4: Electronegativity trend.
Electronegativity increases across period → higher electron affinity. Oxygen less negative than F or Cl.
Step 5: Cross-check.
Sulphur (larger than oxygen) has more negative EGE than oxygen → oxygen is least negative.
Step 6: Conclusion.
Thus, oxygen has the least negative electron gain enthalpy.
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