What do the elements in group 17 of the periodic table have in common

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What do the elements in group 17 of the periodic table have in common

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Nick 4 days 2021-07-22T17:28:29+00:00 1 Answers 2 views 0

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    2021-07-22T17:29:58+00:00

    They are toxic and all non metals

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )