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    Question

    When did Dmitri Mendeleev invent the periodic table,

    ordering the symbols of the chemical elements according to their atomic weights?
    A 1794 Correct Answer Incorrect Answer
    B 1869 Correct Answer Incorrect Answer
    C 1890 Correct Answer Incorrect Answer
    D 1779 Correct Answer Incorrect Answer

    Solution

    The correct answer is B

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