There are seven periods in the periodic table.
The periodic table is organized into horizontal rows called periods and vertical columns called groups. According to the reference material, a period begins at the far left, and a new period starts when a new principal energy level begins filling with electrons. Understanding the arrangement of the periodic table is fundamental to comprehending the properties and relationships of elements.
Here's a breakdown:
- Periods are horizontal rows.
- There are seven periods.
- Each period signifies the filling of electron shells.
