nonmetal

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nonmetal,

chemical elementelement,
in chemistry, a substance that cannot be decomposed into simpler substances by chemical means. A substance such as a compound can be decomposed into its constituent elements by means of a chemical reaction, but no further simplification can be achieved.
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 possessing certain properties by which it is distinguished from a metalmetal,
chemical element displaying certain properties by which it is normally distinguished from a nonmetal, notably its metallic luster, the capacity to lose electrons and form a positive ion, and the ability to conduct heat and electricity.
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. In general, this distinction is drawn on the basis that a nonmetal tends to accept electrons and form negative ionsion,
atom or group of atoms having a net electric charge. Positive and Negative Electric Charges

A neutral atom or group of atoms becomes an ion by gaining or losing one or more electrons or protons.
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 and that its oxide is acidic. Nonmetals are poor conductors of heat and electricity (see conductionconduction,
transfer of heat or electricity through a substance, resulting from a difference in temperature between different parts of the substance, in the case of heat, or from a difference in electric potential, in the case of electricity.
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) and do not have the luster of metals. Arsenic, antimony, selenium, and tellurium exhibit both nonmetallic and metallic properties and are called metalloids. Unlike the metals, which are all solids (with the exception of mercury) under ordinary conditions of temperature and pressure, the nonmetals appear in all three states. Argon, chlorine, fluorine, helium, hydrogen, krypton, neon, nitrogen, oxygen, and xenon are normally gases. Bromine is a liquid. Boron, carbon, iodine, phosphorus, silicon, and sulfur are solids. Certain of them, e.g., boron, carbon, iodine, silicon, and sulfur, form crystals, as do the metals. In hardness they vary considerably. Carbon in its allotropic form, the diamond, is the hardest element known. With the exception of carbon, sulfur, nitrogen, oxygen, and the inert gases—argon, helium, krypton, neon, and xenon—the nonmetals do not occur uncombined in nature, but exist in numerous relatively abundant compounds, among which are the oxides, halides (binary halogen compounds), sulfides, carbonates, nitrates, phosphates, silicates, and sulfates. With a few exceptions, the nonmetallic elements are important chiefly for their compounds. For the properties and uses of specific nonmetals, see the separate articles on these elements.

nonmetal

any of a number of chemical elements that form negative ions, have acidic oxides, and are generally poor conductors of heat and electricity
References in periodicals archive ?
"Macedonia has a negative trend in the non-metal industry and mining companies need to intensify their processing on non-metal raw materials into products of a higher processing degree," said Nikolajco Nikolov of the Mining Association of the Economic Chamber of Macedonia.
Juan Jose Ballen, Comacsa's CEO states, "Non-metal mining provides domestically produced supplies used to produce textiles, pharmaceuticals, chemicals, paint, agricultural goods, poultry food, oil, mining, food and drink." According to the Export Association (ADEX, its Spanish acronym), this activity represents 1.34 % of Peru's GDP in 2014 and generates an estimated $1 billion in revenues for the country.
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NewAge offers Kwik Clamp, its brand of nylon double bond clamps, as a non-metal option.
Exports of metal and non-metal mineral products, as well as motor vehicles and automobile parts all declined.
He added that the mineral reserves include 12 metal and 36 non-metal ores.
Elsewhere, the deputy minister also noted that "extraction of non-metal minerals increased by 7 percent, while non-metal mineral reserves showed a 16-percent growth during the two-year period."
An interionic bond forms when a highly electropositive metal ion is combined with a highly electronegative non-metal ion.
ISLAMABAD, March 07, 2012 (Balochistan Times): New evidence shows that heavy exposure of exhaust from diesel engines increase the risk of developing and dying from lung cancer, according to a study of non-metal miners in the United States.
* Installation into metal or non-metal panels as thick as l.t mm.
28 November 2011 - CARE today gave a BB rating to the INR150m (USD2.9m/EUR2.2m) long-term bank facilities of Indian metal and non-metal composites supplier Mukti Credits Pvt Ltd, part of textile company Sangam (India) Limited (BOM:514234).

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