The halogens is the name given to the elements in Group 7 of the Periodic Table, including Chlorine and Bromine.
Lithium reacts readily in chlorine gas, producing the salt lithium chloride, LiCl:
Lithium + Chlorine -------> Lithium Chloride
2Li (s) + Cl2 (g) -------> 2LiCl (s)
Lithium reacts with bromine in a similar way, forming lithium bromide. The other alkali metals react similarley, and again the reactions become progressively more violent as you go down the group.
The reactions of the alkali meatls with oxygen, water and the halogens show us that the reactivity of them increase as you go down the group.
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