Q.

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.

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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 B.

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Detailed Solution

Elements are arranged in horizontal rows are called periods (Mendeleev's series) and having similar outer electronic configuration in their atoms are arranged in vertical columns known as groups or families.
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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.