Which is the correct order of atomic sizes?

Question

Which is the correct order of atomic sizes?

Which is the correct order of atomic sizes?
(a) Ce > Sn > Yb > Lu
(b) Sn > Ce > Lu > Yb
(c) Lu > Yb > Sn > Ce
(d) Sn > Yb > Ce > Lu.
(At. Nos. : Ce = 58, Sn = 50, Yb = 70 and Lu = 71)

Monjur Alahi

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2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

(a) :- Generally as we move from left to right in a period, there is regular decrease in atomic radii and in a group as the atomic number increases the atomic radii also increases. Thus the atomic radius of Sn should be less than lanthanides. La > Sn. But due to lanthanide contraction, in case of lanthanides there is a continuous decrease in size with increase in atomic number. Hence the atomic radius follow the given trend :

Ce > Sn > Yb > Lu.