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  2. 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]

  3. 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 ...

  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. Metal - Wikipedia

    en.wikipedia.org/wiki/Metal

    A metallic glass (also known as an amorphous or glassy metal) is a solid metallic material, usually an alloy, with a disordered atomic-scale structure. Most pure and alloyed metals, in their solid state, have atoms arranged in a highly ordered crystalline structure.

  6. Electronegativity - Wikipedia

    en.wikipedia.org/wiki/Electronegativity

    Mainly, this is an attribute of metals, meaning that, in general, the greater the metallic character of an element the greater the electropositivity. Therefore, the alkali metals are the most electropositive of all.

  7. Metallic bonding - Wikipedia

    en.wikipedia.org/wiki/Metallic_bonding

    Metallic bonding is a type of chemical bonding that ... However metals are often readily soluble in each other while retaining the metallic character of their bonding

  8. Post-transition metal - Wikipedia

    en.wikipedia.org/wiki/Post-transition_metal

    There is an abrupt and significant reduction in physical metallic character from group 11 to group 12. [49] Their chemistry is that of main group elements. [50] A 2003 survey of chemistry books showed that they were treated as either transition metals or main group elements on about a 50/50 basis.

  9. Bonding in solids - Wikipedia

    en.wikipedia.org/wiki/Bonding_in_solids

    Metallic solids have, by definition, no band gap at the Fermi level and hence are conducting. Solids with purely metallic bonding are characteristically ductile and, in their pure forms, have low strength; melting points can [inconsistent] be very low (e.g., Mercury melts at 234 K (−39 °C). These properties are consequences of the non ...