Although the halogens and noble gases are all nonmetals, they are in their own groups because of similar properties. There are only seven nonmetals, and they are hydrogen, carbon, nitrogen, oxygen, phosphorus, sulfur, and selenium. In this picture, the elements shown in the darker turquoise are nonmetals; the elements in lighter turquoise are metalloids. Nitrogen and oxygen are gases at room temperature, and the rest are solids at room temperature.
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