Promethium(III) fluoride

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:
 * $$\mathrm{PmF_3\ +\ 3\ Li\ \longrightarrow \ Pm\ +\ 3\ LiF}$$