请输入您要查询的英文单词:

 

单词 nonmetal
释义

nonmetal


non·met·al

N0142200 (nŏn-mĕt′l)n. Any of a number of elements, such as oxygen or sulfur, that lack the physical and chemical properties of metals.

nonmetal

(ˌnɒnˈmɛtəl) n (Elements & Compounds) any of a number of chemical elements that form negative ions, have acidic oxides, and are generally poor conductors of heat and electricity

non•met•al

(nɒnˈmɛt l)

n. 1. an element not having the character of a metal, as carbon or nitrogen. 2. an element incapable of forming simple positive ions in solution. [1865–70] non`me•tal′lic (-məˈtæl ɪk) adj.
Thesaurus
Noun1.nonmetal - a chemical element lacking typical metallic propertieschemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
Adj.1.nonmetal - not containing or resembling or characteristic of a metal; "nonmetallic elements"nonmetallic
Translations
неметалл

nonmetal


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.
..... Click the link for more information.
 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.
..... Click the link for more information.
. 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.
..... Click the link for more information.
 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.
..... Click the link for more information.
) 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

nonmetal


  • all
  • noun
  • adj

Synonyms for nonmetal

noun a chemical element lacking typical metallic properties

Related Words

  • chemical element
  • element

adj not containing or resembling or characteristic of a metal

Synonyms

  • nonmetallic
随便看

 

英语词典包含2567994条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。

 

Copyright © 2004-2022 Newdu.com All Rights Reserved
更新时间:2025/3/2 3:45:20