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
Yb+3 < Pm+3 < Ce+3 < La+3
At nos. 70 61 58 57
This is due to lanthanide contraction
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