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    Question

    The base of the modern periodic table is

    A atomic weight Correct Answer Incorrect Answer
    B atomic number Correct Answer Incorrect Answer
    C atomic volume Correct Answer Incorrect Answer
    D atomic energy Correct Answer Incorrect Answer

    Solution

    The modern periodic table is based on the atomic number (number of protons in an atom) rather than atomic weight. This arrangement, proposed by Moseley, resolves anomalies in Mendeleev's periodic table.

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