P4 - Atomic Structure

P4 - Atomic Structure

1. Structure of the atom

   • Relative charge
     • Proton
       • +1
     • Neutron
       • 0
     • Electron
       • -1
   • Relative mass
     • proton
       • 1
     • neutron
       • 1
     • electron
       • Close to 0 (1/2,000)

2. types of radiation

   • charge
     • alpha
       • +2
     • beta
       • -1
     • gamma
       • 0
   • range in air
     • alpha
       • few cm
     • beta
       • around a meter
     • gamma
       • infinete
   • penetration
     • alpha
       • stopped by paper
     • beta
       • stoped by few mm of aluminum
     • gamma
       • few cm of copper
   • ionisation
     • alpha
       • high
     • beta
       • medium
     • gamma
       • low

3. isotopes

   • isotopes are an atom with the same number of electrons and protrons and a different number of neutrons