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  2. List of alternative nonmetal classes - Wikipedia

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

    Metallic bonding tends to involve close-packed centrosymmetric structures with a high number of nearest neighbours. Post-transition metals and metalloids, sandwiched between the true metals and the nonmetals, tend to have more complex structures with an intermediate number of nearest neighbours

  3. Properties of nonmetals (and metalloids) by group - Wikipedia

    en.wikipedia.org/wiki/Properties_of_nonmetals...

    Silicon is a metallic-looking relatively unreactive solid with a density of 2.3290 g/cm 3, and is hard (MH 6.5) and brittle. It melts at 1414 °C (cf. steel ~1370 °C) and boils at 3265 °C. Silicon has a diamond cubic structure (CN 4). It is a non-conductive with a band gap of about 1.11 eV. [3]

  4. Nonmetal - Wikipedia

    en.wikipedia.org/wiki/Nonmetal

    Nonmetals have relatively high values of electronegativity, and their oxides are usually acidic. Exceptions may occur if a nonmetal is not very electronegative, or if its oxidation state is low, or both. These non-acidic oxides of nonmetals may be amphoteric (like water, H 2 O [63]) or neutral (like nitrous oxide, N 2 O [64] [h]), but never basic.

  5. 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]

  6. 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 ...

  7. Nonmetallic material - Wikipedia

    en.wikipedia.org/wiki/Nonmetallic_material

    There are many cases where an element or compound is metallic under certain circumstances, but a nonmetal in others. One example is metallic hydrogen which forms under very high pressures. [44] There are many other cases as discussed by Mott, [4] Inada et al [5] and more recently by Yonezawa. [2]

  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.