The elements fluorine, chlorine, bromine, and iodine are all found in the same group (17) on the table. These elements are grouped together because they *
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Halogens are highly reactive nonmetallic elements in group 17 of the periodic table . As you can see in the periodic table below, the halogens include the elements fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At) . Therefore, halogens have seven valence electrons .
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