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  2. Nonmetal - Wikipedia

    en.wikipedia.org/wiki/Nonmetal

    [8] [9] There is no widely accepted precise definition; [10] any list of nonmetals is open to debate and revision. [1] The elements included depend on the properties regarded as most representative of nonmetallic or metallic character. Fourteen elements are almost always recognized as nonmetals: [1] [2]

  3. Nonmetallic material - Wikipedia

    en.wikipedia.org/wiki/Nonmetallic_material

    Yonezawa provides a general definition: [2]: 260 When a material 'conducts' and at the same time 'the temperature coefficient of the electric conductivity of that material is not positive under a certain environmental condition,' the material is metallic under that environmental condition. A material which does not satisfy these requirements is ...

  4. Properties of metals, metalloids and nonmetals - Wikipedia

    en.wikipedia.org/wiki/Properties_of_metals...

    The most stable form is the black allotrope, which is a metallic looking, brittle and relatively non-reactive semiconductor (unlike the white allotrope, which has a white or yellowish appearance, is pliable, highly reactive and a semiconductor). When assessing periodicity in the physical properties of the elements it needs to be borne in mind ...

  5. List of alternative nonmetal classes - Wikipedia

    en.wikipedia.org/wiki/List_of_alternative...

    This gradual reduction in the number of nearest neighbours corresponds (approximately) to a reduction in metallic character. A similar progression is seem among the metals. Metallic bonding tends to involve close-packed centrosymmetric structures with a high number of nearest neighbours.

  6. List of nonmetal monographs - Wikipedia

    en.wikipedia.org/wiki/List_of_nonmetal_monographs

    "In its chemical characters , antimony is closely allied to arsenic on the one hand, and to bismuth on the other; it constitutes, indeed, a connecting link between the metals and the non-metals." (p. 442) Roscoe HE & Schorlemmer C 1891, A Treatise on Chemistry, Vol. 1 The Nonmetallic Elements, D Appleton and Company, New York

  7. Periodic trends - Wikipedia

    en.wikipedia.org/wiki/Periodic_trends

    Across each period, from left to right, the increasing attraction between the nuclei and the outermost electrons causes the metallic character to decrease. In contrast, the nonmetallic character decreases down the groups and increases across the periods. [27] [28]

  8. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    Metallic character increases going down a group and from right to left across a period. Nonmetallic character increases going from the bottom left of the periodic table to the top right. The first periodic table to become generally accepted was that of the Russian chemist Dmitri Mendeleev in 1869; he formulated the periodic law as a dependence ...

  9. Nonmetal (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Nonmetal_(disambiguation)

    Nonmetals in the periodic table or non-metallic elements, are elements that have high electronegativity and mostly lack distinctive metallic properties. Nonmetal, in astronomy, the two elements hydrogen and helium without metallicity .