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Horizontal rows of periodic table were called as series by Mendeleev and we call these as periods.

Elements having similar out electronic configurations in their atoms are arranged in periods.

According to IUPAC the groups are numbered from 1 to 18 replacing older notation of groups IA…….. VIIA, VIII, IB…….VIIB and 0 (zero).

The seven periods are numbered based on the highest principal quantum number (n) of the elements in the period.

answer is B.

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Detailed Solution

Elements having similar electronic configurations in valence shell of their atoms are arranged in same vertical columns called as groups or families.

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