Five nonmetals are solids at room temperature: iodine, carbon, phosphorous, sulfur and selenium. One nonmetal, bromine, is a liquid. The other 11 nonmetals exits as gases at room temperature.
The majority of elements are classified as metals. Seventeen are classified as nonmetals, including all the noble gases. Nonmetals share some basic characteristics: they tend to be brittle and transparent and lack a metallic shine. All nonmetals tend to be poor conductors of electricity and heat. They make good oxidizing agents and will form acidic oxides. Nonmetals typically have more than 3 electrons in their outer shells, allowing them to share or gain electrons easily. They also have higher electronegativities than the metallic elements.