Periodic table is a chart that lists all known elements. It organizes elements by their atomic number and shared properties. Each element is shown with a name, symbol, and number. The table helps scientists compare and group elements.

The periodic table was first created in the 19th century and has been updated over time. It is used by scientists around the world. The table is arranged in rows called periods and columns called groups.

The periodic table includes more than 100 known elements. These elements are found in nature and in laboratories. The table is an important tool for studying matter.