NEET 2021 · ChemistryPrevious Year Question
() and () have similar atomic and ionic radii because of:
Answer: (A) lanthanoid contraction. \textbf{Answer:} (A) lanthanoid contraction \textbf{Solution:} immediately follows the lanthanoids in the periodic table.
- A.lanthanoid contraction✓
- B.having similar chemical properties
- C.belonging to same group
- D.diagonal relationship
Correct Answer
(A) lanthanoid contraction
Solution & Explanation
\textbf{Answer:} (A) lanthanoid contraction \textbf{Solution:} immediately follows the lanthanoids in the periodic table. The poor shielding by the intervening electrons increases the effective nuclear charge and offsets the expected size increase on moving down the group. As a result, and have nearly identical atomic and ionic radii. This anomaly is the lanthanoid contraction.
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