+**Coordination number** is the count of atoms, ions, or [ligands](/wiki/ligand) directly bonded to a central atom or ion within a [complex](/wiki/complex) or crystal structure. This fundamental value defines the immediate spatial arrangement around the central species, significantly influencing its molecular geometry and overall properties.
+## See also
+- [Geometry](/wiki/geometry)
+- [Bonding](/wiki/bonding)
+- [Crystal](/wiki/crystal)
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