Answer: 1) Coordination compound: A compound containing coordinate bonds, typically between a central metal atom and a number of other atoms or groups.
2) Coordination number: The number of atoms or ions immediately surrounding a central atom in a complex or crystal.
3) Ligand: An ion or molecule attached to a metal atom by coordinate bonding.
A molecule that binds to another (usually larger) molecule.
4) Denticity: Refers to the number of donor groups in a single ligand that bind to a central atom in a coordination complex. In many cases, only one atom in the ligand binds to the metal, so the denticity equals one, and the ligand is said to be monodentate (sometimes called unidentate ).
5) Chelation: A compound containing a ligand (typically organic) bonded to a central metal atom at two or more points.
Explanation: Hope this answers your question :)