Here's a breakdown:

* Left side: This includes groups 1 and 2 (alkali and alkaline earth metals).

* Middle: This includes the transition metals (groups 3-12) and some elements in the lanthanide and actinide series (at the bottom of the table).

* Right side: The elements on the right side of the periodic table are generally non-metals.

Exceptions:

* Hydrogen: Although it's located on the left side, hydrogen is a non-metal.

* Metalloids: Found along the "staircase" line separating metals and non-metals, these elements exhibit properties of both metals and non-metals.

Overall, metals occupy the majority of the periodic table.