The number of ligands directly bonded to the central metal in a coordination complex is called?

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The number of ligands directly bonded to the central metal in a coordination complex is called?

The key idea is the coordination number, which is the number of donor atoms directly bonded to the central metal. It tells you how many attachment sites around the metal are occupied by ligands. For monodentate ligands like NH3 or CN-, each ligand provides one attachment, so the coordination number equals the number of ligands. But for polydentate ligands, a single ligand can bind through two or more donor atoms, contributing multiple attachments and increasing the coordination number accordingly. For example, a complex with four CN− ligands has a coordination number of 4, while one with six NH3 ligands has a coordination number of 6. This term specifically captures how many binding sites around the metal are utilized, regardless of how many distinct ligands are present.

The key idea is the coordination number, which is the number of donor atoms directly bonded to the central metal. It tells you how many attachment sites around the metal are occupied by ligands. For monodentate ligands like NH3 or CN-, each ligand provides one attachment, so the coordination number equals the number of ligands. But for polydentate ligands, a single ligand can bind through two or more donor atoms, contributing multiple attachments and increasing the coordination number accordingly. For example, a complex with four CN− ligands has a coordination number of 4, while one with six NH3 ligands has a coordination number of 6. This term specifically captures how many binding sites around the metal are utilized, regardless of how many distinct ligands are present.

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