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Q.

Assertion (A) Sixth and seventh periods in the periodic table contains 14 elements.Reason (R) In the periodic table 14 elements of sixth and seventh periods are known as lanthanoids and actinoids

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a

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

b

Both A and R are correct; and R is not the correct explanation of A.

c

A is correct; R is incorrect.,

d

R is correct; A is incorrect.

answer is D.

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Detailed Solution

Sixth period contains 32 elements and,seventh period is incomplete and like sixth the period would have 32 elements.
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