Nonmetal or non-metal means the substance does not have the properties of a metal. They can be gases or elements that do not look like metals. Examples of gases are: hydrogen, helium, oxygen, nitrogen, fluorine, neon, argon, krypton, or radon, just to name a few. An example of a solid that is a nonmetal is sulfur. It is yellow and not shiny at all. An example of a liquid that is a nonmetal is bromine. It is red. A non metal is also a great insulator. Usually gases or brittle solids are non-metals. Every element on the periodic table can be classified as metal or non-metal.