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    science
    Grade-5
    Easy

    Question

    Atomic weight of an element in this picture is the sum of 

    1. 10+10=20
    2. 10+20=30
    3. 2+18=20
    4. 3+17=20

    hintHint:

    Protons + Neutrons = Atomic Mass

    The correct answer is: 10+10=20

      Atomic mass of an element is the sum of protons and neutrons in the nucleus. So here the atomic mass is 20 and no. of protons are 10 so the number of neutrons should be 10. Hence 10+10=20

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