Nonmetal

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Nonmetal is a term used in chemistry when classifying the chemical elements. On the basis of their general physical and chemical properties, every element in the periodic table can be termed either a metal or a non-metal. (A few elements with intermediate properties are referred to as metalloids.)

The elements generally regarded as nonmetals are:

There is no rigorous definition for the term "nonmetal" - it covers a general spectrum of behaviour. Common properties considered characteristic of a nonmetal include:

Only eighteen elements in the periodic table are generally considered nonmetals, compared to over eighty metals, but nonmetals make up most of the crust, atmosphere and oceans of the earth. Bulk tissues of living organisms are composed almost entirely of nonmetals. Many nonmetals (hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, and iodine) are diatomic, and most of the rest are polyatomic.

Metallisation at huge pressures

Nevertheless, even these 20 elements tend to become metallic at large enough pressures (see nearby periodic table at ~300 GPa).

See also

ar:لا فلز ast:Non metal bs:Nemetal bg:Неметал ca:No metall cs:Nekov cy:Anfetel da:Ikke-metal de:Nichtmetalle et:Mittemetallid el:Αμέταλλα eo:Nemetalo eu:Ez-metal ko:비금속 is:Málmleysingi it:Non metallo he:אל מתכת lmo:Minga metàj hu:Nemfémek mk:Неметал ms:Bukan logam nl:Niet-metaal no:Ikke-metall nn:Ikkje-metall nds:Nichtmetall qu:Mana q'illay simple:Nonmetal sl:Nekovina sr:Неметал fi:Epämetalli sv:Icke-metall th:ธาตุอโลหะ uk:Неметали



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