4. [ Assertion (A): Lanthanoids and actinoids belong to IIIB group. Reason (R) : Lanthanoids belong to VI period and actinoids belong to VII period. a) Both A and R are correct and R is the correct explanation of A. b) Both A and R are correct but R is not the correct explanation of A. c) A is correct, R is incorrect. d) A is incorrect but R is correct in chemistry
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Verified answer
Answer:
Assertion is True, Reason is True but Reason is not correct explanation of Assertion
Explanation:
Lanthanoids and actinoids belong to IIIB group.
Lanthanoids belong to VI period and actinoids belong to VII period.