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[Are nonmetals and occur in combined form in nature, mainly as metal halides.

-Are found in the rocks of Earth's crust and dissolved in sea water .

-Range from fluorine, the 13th most abundant element, to astatine, which is one of the rarest.

-Exist at room temperature as a gas (F2 and Cl2), a liquid (Br2), and a solid (I2 and At)

-Have seven valence electrons.

-Tend to gain one electron to form a halide, X- ion, but also share electrons and have positive oxidation states.

-Are reactive, with fluorine being the most reactive of all nonmetals

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Junius Weimann

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3y ago

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