A coordination polyhedron is the spatial arrangement of ligand atoms directly attached to the central atom/ion. Common polyhedra include octahedral (e.g., [Co(NH₃)₆]³⁺), tetrahedral (e.g., [Ni(CO)₄]), and square planar (e.g., [PtCl₄]²⁻).
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A coordination polyhedron is the spatial arrangement of ligand atoms directly attached to the central atom/ion. Common polyhedra include octahedral (e.g., [Co(NH₃)₆]³⁺), tetrahedral (e.g., [Ni(CO)₄]), and square planar (e.g., [PtCl₄]²⁻).