(B) The ionic radii of trivalent lanthanides decrease progressively with an increase in atomic number. This phenomenon is known as lanthanide contract

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The ionic radii of trivalent lanthanides steadily increase with increase in atomic number.

(B) The ionic radii of trivalent lanthanides decrease progressively with an increase in atomic number. This phenomenon is known as lanthanide contraction. Therefore,the statement that ionic radii increase with atomic number is false.

Class 12 Chemistry d-and f-Block Elements Lanthanoids and Actinoids

Medium

Which one of the following statements concerning lanthanide elements is false?

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A
Lanthanides are separated from one another by ion exchange method.
B
The ionic radii of trivalent lanthanides steadily increase with increase in atomic number.
C
All lanthanides are highly dense metals.
D
Most characteristic oxidation state of lanthanides is $+3$.