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...ner]] proposed in 1893 that Co(III) bears six [[ligands]] in an octahedral geometry. His theory allows one to understand the difference between coordinated and ===Geometry===

...atoms around the central atom. One or more italicised letters indicate the geometry, e.g. ''TP''-3 which is followed by a number that gives the coordination nu |''T''-4||tetrahedral geometry – 4 coordinate||[[Tetrahedral molecular geometry]]