ATOM

ATOM

1. ATOMS

   • really small
   • positively charged necleus
   • negative electrons
   • electrons move around the nucleus in layers
     • layers = shells
   • history
     • the structure ha changed through history
     • Rutherford
       • plum pudding modle
       • + suudents Geiger and Marsden
       • gold foil experement
         • fired + particles at a sheet of gold sheet
         • expected MOST to be deflected
         • BUT most did pass streight through
         • this proved that the plum pudding was wrong
     • Bohr model
       • 1909

2. MOLECULES

   • atoms are from bonds to make molecules
   • <

3. COMPOUNDS

   • atoms are form bonds to make compounds
   • >

4. FORMULARS

   • displayed
     • shows the atoms and the covalent bonds in a molecule as a picture
   • molecular
     • shows the number and type of atom in a molecule.
   • CO2 - carbon dioxide
   • H2 - hydrogen
   • H2O - water
   • HCL - hydrocloric acid
   • CaCL2 - calcium chloride
   • CO - carbon monoxide
   • MgCL2 - Magnesium chloride
   • CaCO3 - calcium carbonate
   • H2SO4- sulfuric acid
   • MgSO4 - Magnesium sulfate

5. charged stoms are known as ions