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    Chemistry
    Grade-9
    Easy

    Question

    Who designed the framework of the periodic table?

    1. Mendeleev
    2. Bohr
    3. Lewis
    4. Democritus

    Hint:

    The modern day periodic table is called Mendeleev's periodic table.

    The correct answer is: Mendeleev


      • Periodic table has 118 elements.
      • The horizontal rows are called periods. There are 7 periods.
      • The vertical columns are called groups. There are 18 groups.
      • The framework of the periodic table was designed by Mendeleev.

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