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A chelate is a coordination compound containing a ligand bonded to a central at two or more points, usucally froming a ring. so if a coordination compound contains at least one non-monodentate ligand it's considered a chelate. An exapmle is ironn in hemoglobin.
Chelation involves the formation or presence of 2 or more separate coordination bonds between a multiple bonded ligand and central atom. The 'chelate' just refers to that specific type of ligand. You can identify based on its polydentate structure.
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