The nonmetal elements occupy the upper right-hand corner of the periodic table. Nonmetals include the nonmetal group, the halogens, and the noble gases. These elements have similar chemical properties that differ from the elements considered metals.
The nonmetal element group is a subset of these elements. The nonmetal element group consists of hydrogen, carbon, nitrogen, oxygen, phosphorus, sulfur and selenium.
Hydrogen acts as a nonmetal at normal temperatures and pressure and is generally accepted to be part of the nonmetal group.
Properties of nonmetals include:
- dull, not shiny
- poor conductor of heat
- poor conductor of electricity
- high ionization energies
- high electronegativity
- not malleable or ductile, usually brittle
- lower density (when compared to metals)
- lower melting point and boiling points (when compared to metals)
- gains electrons in reactions
This is a list of the nonmetal elements in order of increasing atomic number.