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Science

9th

grade

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Atoms and molecules

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25 questions

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  • 1. Multiple Choice
    5 minutes
    1 pt

    Which two particles contribute more to the mass of an atom? (select 2)

    Protons

    Neutrons

    Electrons

    Nucleus

  • 2. Multiple Choice
    5 minutes
    1 pt
    What is at the center of every atom?
    An electron
    A compound
    A molecule
    A nucleus
  • 3. Multiple Choice
    5 minutes
    1 pt
    Image
    The positively charged particles of an atom are the ________.
    electrons
    protons
    neutrons
    protons & neutrons
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