Question:
Identify the pairs of elements, which possess almost the same size as well as properties
Identify the pairs of elements, which possess almost the same size as well as properties
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Due to Lanthanoid contraction, 4d and 5d transition elements in the same group have nearly identical radii.
Updated On: Jun 10, 2026
- I & II only
- II, III & IV only
- III, IV & V only
- I, II & V only
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Lanthanoid contraction is a phenomenon where the atomic radii of elements following the lanthanoids are nearly identical due to poor shielding of 4f electrons.
Step 2: Meaning
Elements in the second and third transition series (5d and 4d) in the same group often exhibit similar atomic sizes.
Step 3: Analysis
Pair II (Zr and Hf), III (Mo and W), and IV (Nb and Ta) are pairs of 4d and 5d elements that exhibit nearly identical ionic/atomic radii due to the lanthanoid contraction effect. Pair I (Ti, Zr) and V (Cr, Mo) belong to the same group but differ significantly in size.
Step 4: Conclusion
Pairs II, III, and IV possess almost the same size and properties.
Final Answer: (B)
Lanthanoid contraction is a phenomenon where the atomic radii of elements following the lanthanoids are nearly identical due to poor shielding of 4f electrons.
Step 2: Meaning
Elements in the second and third transition series (5d and 4d) in the same group often exhibit similar atomic sizes.
Step 3: Analysis
Pair II (Zr and Hf), III (Mo and W), and IV (Nb and Ta) are pairs of 4d and 5d elements that exhibit nearly identical ionic/atomic radii due to the lanthanoid contraction effect. Pair I (Ti, Zr) and V (Cr, Mo) belong to the same group but differ significantly in size.
Step 4: Conclusion
Pairs II, III, and IV possess almost the same size and properties.
Final Answer: (B)
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