Question:
Which lanthanoid from following has highest ionisation \(\left(\mathrm{IE}_1\right)\) enthalpy?
Which lanthanoid from following has highest ionisation \(\left(\mathrm{IE}_1\right)\) enthalpy?
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Look for the lanthanoid with a stable fully filled 4f subshell.
Updated On: Nov 13, 2026
- Tm
- Dy
- Nd
- Yb
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Ionisation enthalpy generally increases slightly across the lanthanoid series, but a stable configuration gives an exceptionally high value.
Step 2: Configurations
Yb is \(4f^{14}6s^2\), with a completely filled 4f subshell, making it stable.
Step 3: Comparison
\(\text{IE}_1\) values in kJ/mol: Nd 533, Dy 573, Tm 597, Yb 603. So Yb is the highest.
Final Answer:
Ytterbium has the highest first ionisation enthalpy. \[ \boxed{\text{(D) }\text{Yb}} \]
Ionisation enthalpy generally increases slightly across the lanthanoid series, but a stable configuration gives an exceptionally high value.
Step 2: Configurations
Yb is \(4f^{14}6s^2\), with a completely filled 4f subshell, making it stable.
Step 3: Comparison
\(\text{IE}_1\) values in kJ/mol: Nd 533, Dy 573, Tm 597, Yb 603. So Yb is the highest.
Final Answer:
Ytterbium has the highest first ionisation enthalpy. \[ \boxed{\text{(D) }\text{Yb}} \]
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