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Un non-métal est un élément chimique dont les atomes du corps simple sont unis par des liaisons covalentes ou des liaisons intermoléculaires, et non par des liaisons métalliques.
Nonmetals are chemical elements that mostly lack distinctive metallic properties. They range from colorless gases like hydrogen to shiny crystals like iodine. Physically, they are usually lighter (less dense) than metals; brittle or crumbly if solid; and often poor conductors of heat and electricity.
Apr 28, 2024 · A nonmetal is a chemical element that mostly lacks metallic attributes. Physically, nonmetals tend to be highly volatile (easily vaporized), have low elasticity, and are good insulators of heat and electricity; chemically, they tend to have high ionization energy and electronegativity values, and gain or share electrons when they react with ...
The chemical elements can be broadly divided into metals, metalloids, and nonmetals according to their shared physical and chemical properties. All metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metals; and have at least one basic oxide.
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Sep 20, 2022 · Nonmetals are generally poor conductors of heat and electricity. Properties of nonmetals are usually the opposite of properties of metals. Nonmetals can be solid, liquid, or gas at room temperature depending upon the element. Sulfur, bromine, and helium are typical nonmetals.
Nonmetals are generally poor conductors of heat and electricity. Properties of nonmetals are usually the opposite of properties of metals. Nonmetals can be solid, liquid, or gas at room temperature depending upon the element. Sulfur, bromine, and helium are typical nonmetals.
Ce sont des éléments électronégatifs, qui ne jouent jamais le rôle de cations dans les électrolyses. Leurs oxydes ne sont pas basiques, mais acides ou neutres. Selon leur valence, on distingue les non-métaux univalents (halogènes), divalents (oxygène, soufre, etc.), trivalents (azote, phosphore, arsenic) et tétravalents (carbone ...
