There are 7 periods in the modern periodic table.

Quick Scoop: How Many Periods?

In chemistry, a period is a horizontal row in the periodic table.

If you count these rows from top to bottom on a standard table, you get a total of 7 distinct periods.

  • Periods run left to right.
  • There are 7 such horizontal rows.
  • Together, they include the 118 known elements.

A simple way to picture it: imagine reading a book line by line—each line is like a period, and there are 7 lines on the page of the periodic table.

TL;DR: The periodic table has 7 periods (horizontal rows).

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