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The lanthanoids and actinoids are someti...

The lanthanoids and actinoids are sometimes called `f`-block transition elements because they have incompleted filled _______`f`-subshells.

A

penultimate

B

ultimate

C

inner

D

antepenultimate

Text Solution

Verified by Experts

The correct Answer is:
D
The last electron added to each element is filled in `(n -2)f`-orbital. These elements are hence called the inner transition elements. Within each series, the properties of the elements are quite similar.
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  19. Which of the following is not the characteristic feature of nonmetals?

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  20. Arrange the following elements in the increasing order of metallic cha...

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