Periodic TableHard

Question

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

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

Solution

According to their positions in the periods, these values are in the order :
            Yb+3 < Pm+3 < Ce+3 < La+3
At nos. 70         61       58         57
This is due to lanthanide contraction

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