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Q.

Both Lanthanides and Actinides are belongs to _____ block

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a

s-block

b

p-block

c

d-block

d

f-block

answer is A.

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Detailed Solution

Both Lanthanides and Actinides are belongs to f-block.  It means the differentiating electron enter into f- sub shell.

Lanthanides: Ce (Z = 58) to Lu (Z = 71) these are belong to 4f block.

Actinides: Th (Z = 90) to Lr (Z = 103) these are belong to 5f block.

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