(D) The option $(D)$ is false. In the lanthanide series,the ionic radii of trivalent lanthanides $(Ln^{3+})$ steadily decrease with an increase in ato

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Ionic radii of trivalent lanthanides steadily increases with increase in atomic number

(D) The option $(D)$ is false. In the lanthanide series,the ionic radii of trivalent lanthanides $(Ln^{3+})$ steadily decrease with an increase in atomic number. This phenomenon is known as lanthanoid contraction,which occurs due to the poor shielding effect of $4f$ electrons.

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

Easy

Which of the following statements regarding Lanthanides is false?

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A
All lanthanides are solid at room temperature
B
Their usual oxidation state is $+3$
C
They can be separated from one another by ion-exchange method
D
Ionic radii of trivalent lanthanides steadily increases with increase in atomic number