Electron Affinity
Mediumchemistry
Which element has the most exothermic (most negative) electron affinity?
Select the correct option:
Solution
Incorrect! Answer:
Cl
- Definition: Electron affinity is the energy change when an electron is added to a neutral gaseous atom.
- Expected Trend: Should increase (become more negative) moving up a group (Cl<F).
- The Discrepancy (F vs Cl):
- Fluorine is very small. When an electron is added to its 2p valence shell, it experiences intense electron-electron repulsion from the highly concentrated existing electrons.
- Chlorine has its valence shell (3p) at a greater distance. It is larger, so it can accommodate the extra electron with significantly less repulsion.
- Outcome: Energy released is higher for Chlorine. Its electron affinity is the most negative in the periodic table (−349 kJ/mol).
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About This Question
- Subject
- chemistry
- Chapter
- classification of elements and periodicity in properties
- Topic
- electron affinity
- Difficulty
- Medium
- Year
- 2025
This medium difficulty chemistry question is from the chapter classification of elements and periodicity in properties, covering the topic of electron affinity. It appeared in the 2025 exam. Practice this and similar questions to strengthen your understanding of classification of elements and periodicity in properties concepts.
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