Reaction of polonium with acids
Polonium dissolves in concentrated hydrochloric acid, HCl, sulphuric acid, H2SO4, or concentrated nitric acid, HNO3.
Reaction of polonium with air
Polonium burns in air, forming polonium(IV) oxide, PoO2:
Po(s) + O2(g) PoO2(s)
Reaction of polonium with halogens
Polonium reacts with chlorine, Cl2, bromine, Br2, and iodine, I2, forming the corresponding Po(IV) halides.
Po(s) + 2 Cl2(g) PoCl4(s) [yellow]
Po(s) + 2 Br2(g) PoBr4(s) [red]
Po(s) + 2 I2(g) PoI4(s) [black]