Periodic Table of the Elements Alkali Metals
When alkali metals react with halogens, halides are formed. All the halides readily dissolve in water except lithium fluoride (LiF). All the halides are ionic in nature except lithium iodide. The chemical reaction of the alkali metals with the halogens is: 2 M + X 2 2 MX (where M represents an alkali metal and X represents a halogen)