Question:
The first ionisation enthalpy is the least in
The first ionisation enthalpy is the least in
Updated On: Apr 4, 2025
- Germanium
- Antimony
- Tellurium
- Arsenic
- Bismuth
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The Correct Option is
Solution and Explanation
The first ionisation enthalpy is the energy required to remove the outermost electron from a neutral atom in the gaseous state.
In general, ionisation enthalpy decreases down a group in the periodic table because the atomic size increases and the outer electrons are farther from the nucleus, experiencing less nuclear attraction.
Given elements (all from Group 15 and 16):
- Germanium (Ge)
- Arsenic (As)
- Antimony (Sb)
- Tellurium (Te)
- Bismuth (Bi)
Among these, Bismuth (Bi) is the heaviest and lies lowest in the group. Hence, it has the largest atomic size and the lowest first ionisation enthalpy.
Correct Answer: (E) Bismuth
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