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1- Particles that make up most of the mass of an atom are________and__________?

2-the particle that makes up most of the volume of an atom is _______?

  • science -

    PLEASE PLEASE H-E-L-P-
    i need to get this done by 8 32 tonight
    PLEASE HELP

  • science -

    1) protons and neutrons


    2) electron

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