Directions In the following questions, an Assertion (A) is followed...

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Directions
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) A is correct; \( \mathrm{R} \) is incorrect.
(d) \( \mathrm{R} \) is correct; \( \mathrm{A} \) is incorrect.
Assertion (A) The horizontal rows in the periodic table are called periods or Mendeleev's series.
Reason (R) Elements having similar outer electronic configurations in their atoms are arranged in groups/families.
\( \mathrm{P} \)
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