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coordination number

noun, Crystallography
1.
the number of anions surrounding a single cation in a stable crystal structure.
Origin
1905-1910
1905-10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for coordination-number

coordination number

noun
1.
(chem) the number of coordinated species surrounding the central atom in a complex or crystal
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Encyclopedia Article for coordination-number

coordination number

the number of atoms, ions, or molecules that a central atom or ion holds as its nearest neighbours in a complex or coordination compound or in a crystal. Thus the metal atom has coordination number 8 in the coordination complexes [Mo(CN)8]4- and [Sr(H2O)8]2+; 7 in the complex [ZrF7]3-; 4 in the complexes [Zn(CN)4]2-, [Cu(CN)4]3-, and [Ni(CN)4]4-; 2 in the complexes [Ag(NH3)2]+, [AuCl2]-, and [HgCl2]. Coordination numbers from 2 to 9 have been observed in complexes; higher coordination numbers occur, although rarely. A given ion or atom does not necessarily have one characteristic coordination number; e.g., Al3+ has coordination number 4 in [AlCl4]- but 6 in [AlF6]3-.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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