ATOMS

ATOMS

1. All matter is made up of atoms.

   • Ancient Greeks thought it was the smallest particle, but later smaller particles were discovered

2. INSIDE THE ATOM

   • AROUND
     • Electrons
       • Negative charge
         • Negligible mass
   • NUCLEUS
     • Protons
       • Positive charge
         • Mass like a hydrogen atom
     • Neutrons
       • No charge
         • Mass like a hydrogen atom

3. ATOMIC MODELS

   • Rutherford
   • Bohr (planetary model)

4. REPRESENTING ATOMS

   • Number of protons
     • Z
   • Mass number
     • A

5. ISOTOPES

   • Atoms with the same number of protons and different number of neutrons

6. ORGANISATION OF ATOMS IN MATTER

   • SIMPLE SUBSTANCES
     • SINGLE ATOMS
       • Noble gases
     • LARGE CLUSTERS
       • Metals
     • MOLECULES
       • Oxygen, nitrogen...
   • COMPOUNDS
     • IONIC CRYSTALS
       • Salt
     • MOLECULES
       • Water, carbon dioxide..

7. IONS

   • Anions
   • Cations