What defines a coordination entity, and provide examples of coordination entities?

A coordination entity in chemistry refers to a complex species comprising a central metal atom or ion bonded to surrounding ions or molecules, known as ligands. Examples include [Co(NH₃)₆]³⁺ (hexaamminecobalt(III)), where cobalt is the central metal, and ammonia ligands surround it. Another example is [Fe(CN)₆]³⁻ (hexacyanidoferrate(III)), where iron serves as the central metal and cyanide ligands surround it. The coordination entity’s structure provides insights into the arrangement and bonding between the central metal and ligands, crucial for understanding the properties and reactivity of coordination compounds in various applications.