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Страницы в категории «Неметаллы» Показано 19 страниц из 19, находящихся в данной категории.
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.
Екстракт периодног система који приказује неметалне елементе (укључујући металоиде).H се нормално поставља изнад Li у Групи 1.
- Properties of Metals
- Properties of Metalloids Or Semimetals
- Properties of Nonmetals
Most of the elements are metals. Metals include the alkali metal, alkaline earth, transition metal, basic metal, lanthanide, and actinide groups. These elements have metallic character, which means atoms easily lose electrons. Metals display the following properties: 1. Solid at room temperature (with the exception of mercury) 2. Usually shiny, wit...
Metalloids or semimetals possess some properties of metals and some of nonmetals. Metalloids typically have several forms or allotropes with very different properties. Characteristics of metalloids include: 1. Could be dull or shiny 2. Conduct heat and electricity, but not as well as metals 3. Good semiconductors 4. Usually malleable 5. Usually duc...
The nonmetals include the nonmetals element group, plus the halogens, and noble gases. Properties of nonmetals include: 1. Dull, not shiny 2. Poor conductor of heat 3. Poor conductor of electricity 4. Not malleable or ductile, usually brittle 5. Lower density (when compared to metals) 6. Lower melting point and boiling points (when compared to meta...
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.
Eighteen nonmetals: He, Ar; F, Cl, Br, I; O, S, Se, Te; N, P, As, Sb; C, Si; B; H. Neon, germanium, krypton and xenon are listed as new or doubtful elements. For Sb, Appleton writes: "Antimony is sometimes classed as a metal, sometimes as a non-metal. In case of several other elements the question of classification is difficult—indeed, the ...
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Rhododendron hirsutum A species of the Vireya section.. Rhododendron subgenus Rhododendron is a subgenus of the genus Rhododendron.With around 400 species, it is the largest of the eight subgenera (more recently reduced to five) containing nearly half of all known species of Rhododendron and all of the lepidote (scales on the underside of the leaves) species.
