What is the term for an ion or molecule that is directly bonded to the central metal ion within a coordination complex?

Explanation

The species that binds directly to the central metal ion in a coordination compound is known as a ligand. Ligands can be ions or molecules that donate electron pairs to the metal ion, forming coordinate bonds. Terms like complexion and chelate are related but have different meanings. Complexion is not a correct term here, and a chelate refers to a ligand that forms multiple bonds with the metal. Potential and electrolyte do not describe this concept.