Sodium polonide
Sodium polonide is a radioactive chemical compound with the formula. This salt is a polonide, a set of very chemically stable compounds of polonium. Due to the difference in electronegativity between sodium and polonium and the slight non-metallic character of polonium, it is intermediate between intermetallic phases and ionic compounds.
Production
This salt may be produced from the reaction between aqueous polonium hydride and sodium metal:This method of synthesis is hampered by the chemical instability of hydrogen polonide.
Sodium polonide may also be produced by heating sodium and polonium together at 300–400 °C.