What are horizontal rows in the periodic table known as?

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Solution

Periodic Table
The periodic table involves $18$ vertical columns and $7$ horizontal rows.
The horizontal rows are referred as periods.
The vertical columns are referred as columns.
Examples
Boron, Carbon and nitrogen are present in same period that is period number $2$ .
Sodium, Potassium and Lithium are present in same group that group number $1$ .
So, horizontal rows in the periodic table are known as periods.

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