Assertion (A): Lanthanides and actinides belong to IIIB group.
Reason (R) : Lanthanides belong to VI period and actinides belong to VII period.

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Both A and R are true and R is not correct explanation of A

A is incorrect and R is correct

A is correct and R is incorrect

Both A and R are true and R is the correct explanation of A

answer is B.

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Detailed Solution

In lanthanoides electrons enter into 4f subshell while in actinoides electrons enter into 5f subshell. Both lanthanides and actinides are placed at IIIB group and they kept in VI period and VII period.

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