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:

$\mathrm{P}\mathrm{m}{\mathrm{F}}_{\mathrm{3}}\mathrm{+}\mathrm{3}\mathrm{L}\mathrm{i}\mathrm{⟶}\mathrm{P}\mathrm{m}\mathrm{+}\mathrm{3}\mathrm{L}\mathrm{i}\mathrm{F}$