Question:
Which element has maximum first ionisation potential?
Which element has maximum first ionisation potential?
Show Hint
Noble gases have maximum ionisation energy due to stable configuration.
Updated On: Apr 16, 2026
- Cs
- F
- Na
- He
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Concept:
Ionisation energy increases across a period and decreases down a group.
Step 1: Trend in periodic table.
Alkali metals like Cs and Na have very low ionisation energy.
Step 2: Comparison.
Fluorine has high ionisation energy but Helium has completely filled shell.
Step 3: Conclusion.
Helium has maximum ionisation energy.
Step 1: Trend in periodic table.
Alkali metals like Cs and Na have very low ionisation energy.
Step 2: Comparison.
Fluorine has high ionisation energy but Helium has completely filled shell.
Step 3: Conclusion.
Helium has maximum ionisation energy.
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