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nonmetal    
n. 非金属

非金属

nonmetal
adj 1: not containing or resembling or characteristic of a
metal; "nonmetallic elements" [synonym: {nonmetallic},
{nonmetal}] [ant: {metal(a)}, {metallic}]
n 1: a chemical element lacking typical metallic properties


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  • Nonmetal - Wikipedia
    In the context of the periodic table, a nonmetal is a chemical element that mostly lacks distinctive metallic properties They range from colorless gases like hydrogen to shiny crystals like iodine
  • Nonmetal | Definition, Properties, Examples, Facts | Britannica
    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
  • Metals, Metalloids, and Nonmetals - Element Classification Groups
    Nonmetals are usually dull, poor conductors of heat and electricity, brittle when solid, and often have lower melting and boiling points Metalloids have properties that are intermediate between metals and nonmetals, making them useful in semiconductor applications
  • Nonmetals Definition and Properties - ThoughtCo
    Nonmetal elements are defined by their lack of metal properties Learn which elements fit this definition and how to identify their characteristics
  • Nonmetals - Chemistry Learner
    Nonmetals are those elements in the periodic table that do not have the typical characteristics of metals such as electrical conductivity, hardness, and ductility [1] Where are nonmetals located in the periodic table?
  • The Chemistry of Nonmetals
    Once the metals and semimetals are removed from the list of known elements, only 17 are left to be classified as nonmetals Six of these elements belong to the family of rare gases in Group VIIIA, most of which are virtually inert to chemical reactions
  • What is Non-Metal? - BYJUS
    Non-metals are those which lack all the metallic attributes They are good insulators of heat and electricity They are mostly gases and sometimes liquid Some of then are even solid at room temperature like Carbon, sulphur and phosphorus Characteristic properties of non-metals are high ionization energies and high electronegativity
  • Structure and General Properties of the Nonmetals
    Nonmetal structures contain covalent bonds, and many nonmetals consist of individual molecules The electrons in nonmetals are localized in covalent bonds, whereas in a metal, there is delocalization of the electrons throughout the solid
  • 6. 6: Nonmetals - Chemistry LibreTexts
    In the chemical world, these “spare parts” would be considered nonmetals, loosely defined as not having the properties of metals A nonmetal is an element that is generally a poor conductor of heat and electricity Most properties of nonmetals are the opposite of metals
  • Nonmetal - New World Encyclopedia
    Only 18 elements of the periodic table are generally considered nonmetals, whereas more than 80 elements are considered metals However, nonmetals and their compounds make up most of the crust, atmosphere, and oceans of the Earth, as well as constituting most of the bulk tissues of living organisms





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