What is the name for the horizontal rows of the periodic table?

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Groups

Periods

Families

Sets

answer is B.

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Detailed Solution

concept - The elements are arranged in the increasing order of their atomic numbers in the long form of the periodic table. This arrangement is based on the modern periodic law which states that the physical and chemical properties of elements are periodic functions of their atomic numbers.
Horizontal rows are referred to as periods and vertical columns are referred to as groups. The groups are numbered from 1 to 18 and the periodic table has a total of 7 periods. Elements in their atoms with similar outer electron configuration are arranged in vertical columns, i.e. groups or families. As a result, elements in a group have similar chemical properties.
Thus, the horizontal rows are given the name periods.
Hence, the correct option is (2).

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