D-And F-Block Elements Ques 244

Question: Arrange Ce+3,La+3,Pm+3 and Yb+3 in increasing order of their ionic radii

[AIEEE 2002]

Options:

A) Yb+3<Pm+3<Ce+3<La+3

B) Ce+3<Yb+3<Pm+3<La+3

C) Yb+3<Pm+3<La+3<Ce+3

D) Pm+3<La+3<Ce+3<Yb+3

Show Answer

Answer:

Correct Answer: A

Solution:

Due to Lanthanoid contraction order will be Yb+3<Pm3+<Ce+3<La3+



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