The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

Particle diagrams can be used to show the atoms ... Compounds are not found on the periodic table. For example, water isn’t on the periodic table because it is a compound, not an element.

The zigzag, staircase, line in the diagram of the periodic table above separates the metals, on the left, from non-metals, on the right. Hydrogen is a non-metal, but it is often put in the middle.