Question:
The ionisation potential order for which set is correct?
The ionisation potential order for which set is correct?
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The ionisation potential order for which set is correct?
Updated On: Apr 15, 2026
- $Cs<Li<K$
- $Cs>Li>B$
- $Li>K>Cs$
- $B>Li<K$
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The Correct Option is C
Solution and Explanation
Step 1: Concept
Ionisation potential (IP) is the energy required to remove an electron. IP decreases as you move down a group because the atomic radius increases and shielding increases.
Step 2: Analysis
Li, K, and Cs are all Alkali metals (Group 1). Their order in the group is: Li (top) $\rightarrow$ Na $\rightarrow$ K $\rightarrow$ Rb $\rightarrow$ Cs (bottom).
Step 3: Conclusion
IP follows the trend: $Li>K>Cs$.
Final Answer: (C)
Ionisation potential (IP) is the energy required to remove an electron. IP decreases as you move down a group because the atomic radius increases and shielding increases.
Step 2: Analysis
Li, K, and Cs are all Alkali metals (Group 1). Their order in the group is: Li (top) $\rightarrow$ Na $\rightarrow$ K $\rightarrow$ Rb $\rightarrow$ Cs (bottom).
Step 3: Conclusion
IP follows the trend: $Li>K>Cs$.
Final Answer: (C)
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