the atom

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  • the atom
    • nucleus contains protons and neutrons
    • electrons
      • negatively charged
      • same number of protons and electrons in a n atom
    • protons
      • positively charged
      • mass number = protons + neutrons
      • atomic number = number of protons
    • neutrons
      • neutral
    • relative masses
      • protons:1 neutrons:1 electrons: 0.005

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