Directions In the following questions, an Assertion (A) is followed...
0Directions In the following questions, an Assertion (A) is followed by a corresponding Reason (R). Use the following keys to choose the appropriate answer.
(a) Both A and R are correct; \( \mathrm{R} \) is the correct explanation of \( \mathrm{A} \).
(b) Both A and R are correct; and R is not the correct explanation of A.
(c) \( \mathrm{A} \) is correct; \( \mathrm{R} \) is incorrect.
(d) \( \mathrm{R} \) is correct; \( \mathrm{A} \) is incorrect.
Assertion (A) Sixth and seventh periods in the periodic table contains 14 elements.
Reason (R) In the periodic table 14 elements each of sixth [from \( Z=58 \) to \( Z=71 \) ] and seventh periods [from \( Z=90 \) to \( Z=103 \) ] respectively are known as lanthanoids and actinoids.
\( \mathrm{P} \)
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