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Q.

The elements in the long form of the periodic table are arranged in the
increasing order of their atomic number.

Periods: There are 7 horizontal rows in the periodic table. These are called periods.

Groups: There are 18 vertical columns in the periodic table called groups. They are represented as

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The elements in the long form of the periodic table are arranged in the increasing order of their atomic number. Periods: There are 7 horizontal rows in the periodic table. These are called periods. Groups: There are 18 vertical columns in the periodic table called groups. They are represented as