Answer. For example, graphite has a relatively high electrical conductivity within the carbon planes, and diamond has the highest thermal conductivity of any known substance. Diamond, for example, consists of carbon atoms held together by covalent bonds in a crystalline structure. One direction; used in batteries. Covalent Solids Metallic Solids *Many exceptions exist. 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, quartz and graphite.. Properties. Heat and light. High strength (with the exception of graphite) Hydrogen Molecule (H2) is a non-polar covalent bond example, as an electron pair is equally shared between the two hydrogen atoms. Silicon, germanium. Covalent solids A solid that consists of two- or three-dimensional networks of atoms held together by covalent bonds. are formed by networks or chains of atoms or molecules held together by covalent bonds. Variable resistance depends on what? Hydrogen-Bonded Molecular Solids: The molecules of such solids contain polar covalent bonds between H … Solid SO 2 and solid NH 3 are some examples of such solids. The binding arises from the electrostatic attraction of their nuclei for the same electrons. A perfect single crystal of a covalent solid is therefore a single giant molecule. Note that network solids are compounds containing covalent bonds that violate some of these "rules". Ammonium Chloride A perfect single crystal of a covalent solid is therefore a single giant molecule. Hydrogen. Example of covalent network solid. Examples of semiconductors. Polymorphs. This is an example of a polar covalent bond, which is created because of the higher electronegativity of oxygen. Characteristics of molecular solids. Different crystalline forms of the same element. Covalent solids are formed by networks or chains of atoms or molecules held together by covalent bonds. poor conductors of heat and electricity: This happens when there is a difference between the electronegativity values of each atom. Classes of Crystalline Solids. MEDIUM. An extreme difference forms an ionic bond, while a lesser … A network solid or covalent network solid is a chemical compound (or element) in which the atoms are bonded by covalent bonds in a continuous network extending throughout the material. For example, the structure of diamond, shown in part (a) in Figure 8.5.1, … Polar molecules occur when two atoms do not share electrons equally in a covalent bond.A dipole forms, with part of the molecule carrying a slight positive charge and the other part carrying a slight negative charge. Covalent Solids. 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