Halogens. Group 7A (Group 17). â€œhalogenâ€. Halos- salt Gen- â€œgenesisâ€, to form SALT FORMERS. All halogensâ€¦. Have 7 electrons in their valence shell Have an oxidation number of -1 Exist, at room temperature, in all three phases of matter Form diatomic molecules. Diatomic molecules.
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with reactive force