nonmetal

(redirected from Non-metal)
Also found in: Dictionary, Thesaurus, Wikipedia.

nonmetal

nonmetal, chemical element possessing certain properties by which it is distinguished from a metal. In general, this distinction is drawn on the basis that a nonmetal tends to accept electrons and form negative ions and that its oxide is acidic. Nonmetals are poor conductors of heat and electricity (see conduction) 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.
The Columbia Electronic Encyclopedia™ Copyright © 2022, Columbia University Press. Licensed from Columbia University Press. All rights reserved.

nonmetal

any of a number of chemical elements that form negative ions, have acidic oxides, and are generally poor conductors of heat and electricity
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
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.
There are also two basic style sneaker shoes introduced in composite toe and non-metal mid-sole.
Energy-Efficient New Construction Window: Savings Existing Construction Double, high-solar Air gain low-E non-metal Conditioning 12% 11% frame thermally improved Triple, high-solar 43% 37% gain low-E non-metal frame thermally improved Compared to same 2,600 sf 2-story house w/clear single-glazing in metal frame, equally oriented, w/typical shading Double, high-solar Heating 24% 15% gain low-E non-metal frame thermally improved Triple, high-solar 26% 16% gain low-E non-metal frame thermally improved Compared to same 2,600 sf 2-story house w/clear double-glazing in metal frame, equally oriented, w/typical shading Source: Efficient Windows Collaborative One national supplier says justifying the value of one specific energy-efficient product is challenging.
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.
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).

Full browser ?