Question:
Which of the following elements does not belong to Lanthanoids?
Which of the following elements does not belong to Lanthanoids?
Show Hint
Lanthanoids run from cerium (Z = 58) to lutetium (Z = 71); protactinium is in the next series.
Updated On: Nov 12, 2026
- \(\text{Nd}\)
- \(\text{Lu}\)
- \(\text{Pa}\)
- \(\text{Pr}\)
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
The lanthanoids are the 14 elements from cerium (\(Z=58\)) to lutetium (\(Z=71\)), where 4f orbitals are filled.
Step 2: Check each element
Nd (\(Z=60\)), Pr (\(Z=59\)) and Lu (\(Z=71\)) lie in this range.
Step 3: Identify the odd one
Pa has \(Z=91\) and belongs to the actinoid series (5f filling).
Final Answer:
Protactinium is an actinoid, not a lanthanoid. \[ \boxed{\text{(C) }\text{Pa}} \]
The lanthanoids are the 14 elements from cerium (\(Z=58\)) to lutetium (\(Z=71\)), where 4f orbitals are filled.
Step 2: Check each element
Nd (\(Z=60\)), Pr (\(Z=59\)) and Lu (\(Z=71\)) lie in this range.
Step 3: Identify the odd one
Pa has \(Z=91\) and belongs to the actinoid series (5f filling).
Final Answer:
Protactinium is an actinoid, not a lanthanoid. \[ \boxed{\text{(C) }\text{Pa}} \]
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