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Which is the correct order of atomic sizes (At. No: Ce=58, Sn=50, Yb=70 and Lu=71)

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Ce > Sn > Yb > Lu

Sn > Ce > Lu > Yb

Sn > Yb > Ce > Lu

Lu > Yb > Sn > Ce

answer is B.

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Detailed Solution

Ionic radii decreases as we move across the period. From left to right i.e. Ce⟶Lu, as a result of lanthanoid contraction. Thus, Ce>Sn>Yb>Lu

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