词条 | Network covalent bonding |
释义 |
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. In a network solid there are no individual molecules, and the entire crystal or amorphous solid may be considered a macromolecule. Formulas for network solids, like those for ionic compounds, are simple ratios of the component atoms represented by a formula unit.[1] 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 SiO2 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 holding the layers together.[1] Disordered network solids are termed glasses. These are typically formed on rapid cooling of melts so that little time is left for atomic ordering to occur. [2] Properties
See also
References1. ^1 {{citation |authors=Steven S. Zumdahl; Susan A. Zumdahl |title=Chemistry |publisher=Houghton Mifflin |edition=5 |year=2000 |pages=470–6 |isbn=0-618-03591-5}} {{chemistry-stub}}2. ^Zarzycki, J. Glasses and the vitreous state, Cambridge University Press, New York, 1982. 3. ^Ebbing, Darrell D., and R.A.D. Wentworth. Introductory Chemistry. 2nd ed. Boston: Houghton Mifflin, 1998. Print. 4. ^{{Cite book|title = Chemistry: The Central Science|edition = 11th|last = Brown|first = Theodore L.|last2 = LeMay|first2 = H. Eugene, Jr.|last3 = Bursten|first3 = Bruce E.|last4 = Murphy|first4 = Catherine J.|pages = 466–7|publisher = Prentice Hall|location = Upper Saddle River, NJ|year = 2009|isbn = 978-0-13-600617-6}} 1 : Chemical bonding |
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