Radium iodide

Radium iodide is an inorganic compound of radium and iodine with the chemical formula RaI2. It is the radium salt of hydrogen iodide, consisting of radium cations Ra(2+) and iodide anions I−.

Synthesis
The salt is synthesized by the reaction of radium carbonate with hydroiodic acid:
 * RaCO3 + 2 HI(aq) → RaI2 + H2O + CO2