In chemistry, crystallography, and materials science, the coordination number, also called ligancy, of a central atom in a molecule or crystal is the number of atoms, molecules or ions bonded to it.

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.

The coordination number in a complex molecule or crystal is the number of atoms, ions, or molecules bonded to the central atom. The ion or molecule surrounding the central atom is …

Jun 9, 2025 · The coordination number is the count of atoms bonded to a central atom in a molecule. Coordination number varies from 2 to 16 and is affected by atom size and charge. …

5 days ago · Coordination number. When a ligand donates its electrons to a metal center to form a new metal-ligand bond, the electron density around the metal increases, raising the overall …

Jan 1, 2026 · The coordination number is the number of ions that immediately surround an ion of the opposite charge within a crystal lattice. If you examine the figure below, you will see that …

Chemists use the term coordination number (CN) to describe the number of atoms or groups bound to a central atom. Importantly, coordination number applies to all chemical structures …