Ionization Enthalpy
Among Li, Be, B and C, the first ionization enthalpy is lowest for:
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About This Question
- Subject
- chemistry
- Chapter
- classification of elements and periodicity in properties
- Topic
- ionization enthalpy
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Li
Lithium has configuration 1s2 2s1 and the valence electron is farthest from the nucleus among these period-2 elements. As effective nuclear charge increases from Li to C, removal of electron becomes progressively harder overall. Therefore Li has the lowest first ionization enthalpy in this set.
This medium difficulty chemistry question is from the chapter classification of elements and periodicity in properties, covering the topic of ionization enthalpy. It appeared in the 2025 exam.
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