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coordination number

American

noun

Crystallography.

the number of anions surrounding a single cation in a stable crystal structure.

coordination number British

noun

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

Etymology

Origin of coordination number

First recorded in 1905–10

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Octahedral complexes have a coordination number of six, and the six donor atoms are arranged at the corners of an octahedron around the central metal ion.

From Textbooks • Feb. 14, 2019

What is the coordination number of a nickel atom?

From Textbooks • Feb. 14, 2019

For transition metal complexes, the coordination number determines the geometry around the central metal ion.

From Textbooks • Feb. 14, 2019

What is the coordination number of an aluminum atom in the face-centered cubic structure of aluminum?

From Textbooks • Feb. 14, 2019

For transition metals with a coordination number of four, two different geometries are possible: tetrahedral or square planar.

From Textbooks • Feb. 14, 2019

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023