A non-metal is a type of chemical element that lacks metallic properties. Typically found on the right side of the periodic table, non-metals exhibit varied physical states, including gases (like oxygen and nitrogen), solids (such as sulfur and carbon), and a few liquid forms (like bromine).
Non-metals generally have lower electrical conductivity, lack luster, and often gain electrons to form negatively charged ions. They play essential roles in diverse fields, from supporting life (as in the case of oxygen) to serving as building blocks for various compounds.