Question:
The alkali metal with the highest first enthalpy of ionization is ________.
The alkali metal with the highest first enthalpy of ionization is ________.
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Smallest size = Highest Ionization Energy (in a group).
Updated On: Jun 26, 2026
- Cs
- Rb
- K
- Na
- Li
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The Correct Option is
Solution and Explanation
Step 1: Concept
Ionization enthalpy decreases down a group in the periodic table.
Step 2: Meaning
Down the group, atomic size increases and shielding effect increases.
Step 3: Analysis
Lithium ($Li$) is at the top of the alkali metal group.
Step 4: Conclusion
Being the smallest atom, $Li$ has the highest ionization enthalpy. Final Answer: (E)
Ionization enthalpy decreases down a group in the periodic table.
Step 2: Meaning
Down the group, atomic size increases and shielding effect increases.
Step 3: Analysis
Lithium ($Li$) is at the top of the alkali metal group.
Step 4: Conclusion
Being the smallest atom, $Li$ has the highest ionization enthalpy. Final Answer: (E)
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