Elements of life: The atom

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Atoms are made up of Protons, Neutrons and Electrons

  • Nucleus:
    • most of the mass
    • diameter very small compared to overall size of atom
    • contains protons and neutrons
  • Protons:
    • relative mass: 1
    • relative charge: +1
  • Neutrons:
    • relative mass: 1
    • relative charge: 0
  • Electrons:
    • contained in shells
    • shells make up most of the volume of the atom
    • relative mass: 1/2000
    • relative charge: -1 (negligible)

Nuclear Symbols Show Numbers of Subatomic Particles

  • Mass number
    • above the Element symbol
    • tells the…


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