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

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

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 The d- and f-Block Elements Lanthanoids and Actinoids

Medium

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

AIIMS 2010 All AIIMS

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 $+3$.