What does the dash mark of the 1800s style periodic table represent and tell the original name for element 68

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What does the dash mark of the 1800s style periodic table represent and tell the original name for element 68

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Delwyn 3 weeks 2021-08-23T23:28:24+00:00 1 Answers 0 views 0

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    2021-08-23T23:30:06+00:00

    Answer: element 68 is Erbium, should there be a picture attached?

    Explanation:

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