Question:
Due to lanthanide contraction
Due to lanthanide contraction
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Lanthanide contraction causes elements of 4d and 5d series to have similar sizes.
Updated On: Apr 23, 2026
- Fe, Co, Ni have equal size
- Zr and Hf have equal size
- all f-block ions have equal size
- all isoelectronic ions have equal size
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The Correct Option is B
Solution and Explanation
Concept:
Lanthanide contraction is the gradual decrease in atomic size across lanthanide series due to poor shielding of f-electrons.
Step 1: Effect on elements
Zr (4d) and Hf (5d) have nearly same atomic size due to contraction.
Step 2: Reason
Extra electrons in f-orbitals do not shield effectively → nucleus pulls electrons closer. Conclusion:
Thus, Zr and Hf have almost equal size.
Step 1: Effect on elements
Zr (4d) and Hf (5d) have nearly same atomic size due to contraction.
Step 2: Reason
Extra electrons in f-orbitals do not shield effectively → nucleus pulls electrons closer. Conclusion:
Thus, Zr and Hf have almost equal size.
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