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    Chemistry
    Grade-9
    Easy

    Question

    The order of elements in the modern periodic table is based on an element's

    1. Atomic number
    2. Name
    3. Chemical symbol
    4. Atomic mass

    Hint:

    Arrangement of elements in periodic table is based on atomic number.

    The correct answer is: Atomic number

      • There are 118 elements in periodic table arranged in 18 groups and 7 periods.
      • The horizontal rows are called periods.
      • The vertical columns are called groups.
      • The order of elements in the modern periodic table is based on an element's atomic number.

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