Which is the correct order of atomic sizes (At. No: Ce=58, Sm=62, Yb=70 and Lu=71)
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a
Ce > Sm > Yb > Lu
b
Sm > Ce > Yb > Lu
c
Lu > Yb > Sm > Ce
d
Sm > Yb > Ce > Lu
answer is A.
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Detailed Solution
From cerium (Z=58) to lutecium (Z=71), atomic radius decreses with the exception of europium (Z=63) due to lanthanoid contraction; Atomic radius of …Ce >Sm>Yb>Lu.