JEE Main 2002 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties JEE Main 2002

Which is the correct order of ionic sizes ? (Atomic Number : Ce = 58, Sn = 50, Yb = 70 and Lu = 71)

(1)Ce > Sn > Yb > LuCorrect
(2)Sn > Ce > Lu > Yb
(3)Lu > Yb > Sn > Ce
(4)Sn > Yb > Ce > Lu

Answer: (1)

Solution

Ce, Yb and Lu are lanthanides; because of lanthanide contraction their ion sizes decrease with atomic number: Ce > Yb > Lu. Sn (a group-14 element of the 5th period) forms an ion intermediate in size (e.g.

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Question ID VK-037972