Caesium fluoride
![](/Images/godic/202501/03/Caesium_fluoride2958.jpg")
![](/Images/godic/202501/03/Caesium-fluoride-3D-ionic2958.png")
![Crystalline CsF chains grown inside double-wall carbon nanotubes.[1]](/Images/godic/202501/03/CsF@DWNT2959.png")
![](/Images/godic/202501/03/CsF_desilylation2959.png")
Caesium fluoride or cesium fluoride is an inorganic compound usually encountered as a hygroscopic white solid. It is used in organic synthesis as a source of the fluoride anion. Caesium has the highest electropositivity of all non-radioactive elements and fluorine has the highest electronegativity of all elements.