Question:
Which from following is a lanthanoid element?
Which from following is a lanthanoid element?
Show Hint
Remember the 4f elements: Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu. Erbium (Er) is right near the end.
Updated On: May 14, 2026
- Er
- Am
- Np
- Lr
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Concept
Lanthanoids are the series of 14 elements following Lanthanum ($Z=57$) from Cerium ($Z=58$) to Lutetium ($Z=71$).
Step 2: Meaning
Actinoids are the series from Thorium ($Z=90$) to Lawrencium ($Z=103$).
Step 3: Analysis
- Er (Erbium, $Z=68$) belongs to the $4f$ series (Lanthanoids). - Am (Americium), Np (Neptunium), and Lr (Lawrencium) belong to the $5f$ series (Actinoids).
Step 4: Conclusion
Er is the only lanthanoid among the options. Final Answer: (A)
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