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1. Definitions

   • Atom
     • The smallest particle which can exist on its own
   • Molecule
     • A small group of atoms chemically combined which can exist on their own
   • Element
     • A pure substance which contains only one type of atom
   • Compound
     • Two or more elements chemically combined
   • Atomic Number
     • Number of protons in the atom
   • Mass Number
     • Number of protons plus neutrons in an atom

2. Structure of an Atom

   • An atom consists of 3 types of sub-atomic particles
     • Protons
     • Neutrons
     • Electrons