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Немета́ллы — химические элементы, как правило, не обладающие свойствами металлов. Занимают правый верхний угол Периодической системы элементов и обычно отделены линией (лесенкой). Количество неметаллов составляет 22 - 23 элемента, в зависимости от классификации.
Неметаллы. Азот. Аргон. Астат. Бром. Водород. Гелий. Иод. Кислород. Ксенон. Неон. Псевдогалогены. Радон. Селен. Сера. Углерод. Фосфор. Фтор. Хлор. Категория:
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What are the characteristics of reactive nonmetals near metalloids?
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What are the characteristics of a nonmetal?
From left to right in the periodic table, the nonmetals can be divided into the reactive nonmetals and the noble gases. The reactive nonmetals near the metalloids show some incipient metallic character, such as the metallic appearance of graphite, black phosphorus, selenium and iodine. The noble gases are almost completely inert.
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.
nonmetal, in physics, a substance having a finite activation energy (band gap) for electron conduction. This means that nonmetals display low (insulators) to moderate (semiconductors) bulk electrical conductivities, which increase with increasing temperature, and are subject to dielectric breakdown at high voltages and temperatures.
- The Editors of Encyclopaedia Britannica
Seventeen elements are generally classified as nonmetals; most are gases (hydrogen, helium, nitrogen, oxygen, fluorine, neon, chlorine, argon, krypton, xenon and radon); one is a liquid (bromine); and a few are solids (carbon, phosphorus, sulfur, selenium, and iodine).
Oct 27, 2022 · The nonmetals have higher electronegativities than do metals, and compounds formed between metals and nonmetals are generally ionic in nature because of the large differences in electronegativity between them. The metals form cations, the nonmetals form anions, and the resulting compounds are solids under normal conditions.