Promethium(III) bromide
Promethium bromide is an inorganic compound, with the chemical formula of PmBr3. It is radioactive salt. It is a crystal of the hexagonal crystal system, with the space group of P63/mc.
Preparation
Promethium bromide can be obtained by reacting hydrogen bromide and promethium(III) oxide:Promethium bromide hydrate cannot be heated to form its anhydrous form. Instead it decomposes in water to form promethium oxybromide: