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  2. Network covalent bonding - Wikipedia

    en.wikipedia.org/wiki/Network_covalent_bonding

    Examples of network solids include diamond with a continuous network of carbon atoms and silicon dioxide or quartz with a continuous three-dimensional network of SiO 2 units. Graphite and the mica group of silicate minerals structurally consist of continuous two-dimensional sheets covalently bonded within the layer, with other bond types ...

  3. Bonding in solids - Wikipedia

    en.wikipedia.org/wiki/Bonding_in_solids

    A network covalent solid consists of atoms held together by a network of covalent bonds (pairs of electrons shared between atoms of similar electronegativity), and hence can be regarded as a single, large molecule. The classic example is diamond; other examples include silicon, [3] quartz and graphite.

  4. Molecular solid - Wikipedia

    en.wikipedia.org/wiki/Molecular_solid

    Molecular solids have low melting (T m) and boiling (T b) points compared to metal (iron), ionic (sodium chloride), and covalent solids (diamond). [ 4 ] [ 5 ] [ 8 ] [ 13 ] Examples of molecular solids with low melting and boiling temperatures include argon , water , naphthalene , nicotine , and caffeine (see table below).

  5. Formula unit - Wikipedia

    en.wikipedia.org/wiki/Formula_unit

    In chemistry, a formula unit is the smallest unit of a non-molecular substance, such as an ionic compound, covalent network solid, or metal. [1] [2] It can also refer to the chemical formula for that unit. Those structures do not consist of discrete molecules, and so for them, the term formula unit is used.

  6. Structure of liquids and glasses - Wikipedia

    en.wikipedia.org/wiki/Structure_of_liquids_and...

    Metallic glasses, for example, are typically well described by the dense random packing of hard spheres, whereas covalent systems, such as silicate glasses, have sparsely packed, strongly bound, tetrahedral network structures. These very different structures result in materials with very different physical properties and applications.

  7. Boron nitride - Wikipedia

    en.wikipedia.org/wiki/Boron_nitride

    Very different bonding – strong covalent within the basal planes (planes where boron and nitrogen atoms are covalently bonded) and weak between them – causes high anisotropy of most properties of h-BN. For example, the hardness, electrical and thermal conductivity are much higher within the planes than perpendicular to them.

  8. Covalent network solid - Wikipedia

    en.wikipedia.org/?title=Covalent_network_solid&...

    This page was last edited on 20 July 2010, at 03:13 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...

  9. Van Arkel–Ketelaar triangle - Wikipedia

    en.wikipedia.org/wiki/Van_Arkel–Ketelaar_triangle

    Example is here. On the right side (from ionic to covalent) should be compounds with varying difference in electronegativity. The compounds with equal electronegativity, such as Cl 2 are placed in the covalent corner, while the ionic corner has compounds with large electronegativity difference, such as NaCl (table salt). The bottom side (from ...