![]() So little of it has been produced, it's a matter of prediction, not empirical data. Even though it is in the same column or group of the periodic table with the other halogens, most scientists believe element 117 behaves more like a metalloid. Element 117, tennessine, might have some properties in common with the other elements. They are present in 17th group of the Periodic Table. As you move down the family the state of the halogens is. Fluorine, chlorine, bromine, iodine, and astatine definitely are halogens. Halogens are those elements which react with metals to form salts. Fluorine is the most active nonmetallic element in the periodic table. Halogens include the elements of flourine, chlorine, bromine.
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