Q.

f-block elements are called inner transition elements because

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a

The last electron enters into the f-orbital of the antepenultimate shell 

b

They have been taken out of the transition elements 

c

The last electron enters into the f-orbital of the antepenultimate shell. 

d

The last electron enters into the f-orbital of penultimate shell

answer is D.

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Detailed Solution

f block elements are taken out form IIIB group which belongs to transition elements and the differentiating electron enters into antepenultimate shell 

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