Promethium(III) fluoride or promethium trifluoride is a salt of promethium and fluorine with the formula PmF3.
Promethium(III) fluoride is sparingly soluble in water. It reacts with metallic lithium to yield lithium fluoride and metallic promethium:[1]
PmF3 + 3 Li \longrightarrow Pm + 3 LiF |