Metal halide (compounds between metals and halogens- which consist of five chemically related elements: fluorine, chlorine, bromine, iodine, and astatine) ligands include [TiCl4],  and [FeCl4] which are colorless tetrahedral and [CoCl4], and [NiCl4] which are blue tetrahedral.
Metal halides are compounds between metals and halogens. [TiCl4] [FeCl4] colourless colourless tetrahedral tetrahedral [CoCl4] [NiCl4] blue blue tetrahedral tetrahedral The halogens (/hldn, he-, -lo-, -dn/) are a group in the periodic table consisting of five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). 
