41. Ziegler s work with free radicals led him to the organo compounds of the alkali metals . 42. Pure alkali metals are known examples of this. 43. When there are many helium atoms around, alkali metal ions can attract shells of helium atoms. 44. For example, if sodium is the alkali metal : 45. Many reactions exist with alcohol or amines as the proton donors and alkali metals and electron donors. 46. Such alkali metal bromides include cesium bromide. 47. This transfer is usually only energetically favorable if the aprotic solvent efficiently solvates the alkali metal ion. 48. The alkali metals have good chemical affinity for halogen and should have affinity for excited rare gases. 49. Other alkali metal sulfides behave similarly. 50. Among the atoms that can act as bosons are ordinary hydrogen, metallic sodium and alkali metals like cesium.
