Atomic structure

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  • Atomic structure
    • Atom
      • No overall charge
      • Protons
        • In the nucleus
        • Relative mass 1
        • Charge +1
      • Neutrons
        • In the nucleus
        • Relative mass 1
        • Charge 0
        • Provide a glue to hold the nucleus together despite electrostatic repulsion between protons and electrons
      • Electrons
        • Arranged in shells
        • Relative mass 1/1836
        • Charge -1
      • Every atom of an element has the same number of protons
    • Isotope
      • Atoms of the same element with different numbers of neutrons and different masses
      • Have the same chemical reactions as their electron structure and number does not change
      • physical properties such as boiling point and density may vary slightly due to the change in mass
    • Ion
      • Charged atom
        • Cation- positive ion, fewer electrons than protons
        • Anion- negative ion, more electrons than protons
      • Has a different number of electrons
        • Charged atom
          • Cation- positive ion, fewer electrons than protons
          • Anion- negative ion, more electrons than protons

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