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    Question

    A modern periodic table consists of ________groups and

    _________periods, respectively.
    A 7, 8 Correct Answer Incorrect Answer
    B 7, 18 Correct Answer Incorrect Answer
    C 18, 7 Correct Answer Incorrect Answer
    D 8, 10 Correct Answer Incorrect Answer

    Solution

    In the long form of the periodic table there are 7 horizontal rows called periods and 18 vertical columns called groups .

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