Bromine is the only halogen among the given elements, which include argon, calcium, and lithium. Halogens are located in Group 17 of the periodic table and are known for their reactivity. Examples of halogens include fluorine, chlorine, iodine, and astatine, in addition to bromine. ;
Bromine is the only halogen listed among the options given. Halogens are found in Group 17 of the periodic table, while argon, calcium, and lithium belong to different groups. Therefore, the correct choice is B. bromine .
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