Atoms, Molecules and Ions

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  • Atoms, Molecules and Ions
    • Atom
      • AN ATOM is the smallest particle of an element.
      • They cannot be splitinto smaller particles in chemical reactions
    • Ions
      • AN ION is an atom or group of atoms with an electrical charge (+ or -).
      • Metal compounds such as sodium chloride or copper sulphate contain ions.
      • Note that metals form positive ions while non-metals form negative ions.
    • Solids, Liquids and Gases
      • A solid is represented by (s).
      • A liquid is represented by (l)
      • A gas is represented by (g)
      • Common gases are diatomic (have 2 atoms in each molecule). These are OxygenO2; Hydrogen H2; Nitrogen N2; and Chlorine Cl2.
    • Elementary Particles
      • Atoms are made up of smaller particles called protons, neutrons and electrons.


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