A nonmetal atom or element does not have much or any metal in it. These types of elements have certain characteristics about them compared to the metals that are on the periodic chart. Nonmetals can be vaporized in simple ways and they can conduct heat. On the periodic table, there are 17 elements that are considered to be nonmetals. They are hydrogen, xenon, radon, krypton, fluorine, nitrogen, helium, oxygen, neon, argon, and chlorine.
These are the nonmetals that are gases. The other six elements that are nonmetals include sulfur, selenium, bromine, carbon, radon, phosphorus, and iodine. These are all solids except bromine which is a liquid. If you combined a nonmetal atom with a metal atom, the atom would become larger and there would be more electrons.