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    Chemistry
    Grade-9
    Easy

    Question

    The atomic number of this Na is

    1. 23
    2. 11
    3. 22
    4. 16

    Hint:

    Atomic number of Na is 11.

    The correct answer is: 11

      • Mendeleev periodic table has 118 elements arranged in 18 groups and 7 periods.
      • Moving from left to right atomic number increases by 1.
      • Atomic number of sodium is 11.

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