atoms

atoms

1. subatomic particles

   • protons
     • positive charge
   • electrons
     • negative charge
     • 1800 x smaller than protons and neutrons
   • neutrons
     • no charge

2. symbols

   • compound formulas

3. compounds

   • compound formulas
   • molecules or lattice of atoms

4. electron shells

   • 1st shell - 2 electrons 2nd shell - 8 electrons 3rd shell - 8 electrons
   • electron configuration
     • e.g. Calcium 2, 8, 8, 2
   • electron dot diagram

5. periodic table

   • elements
     • one type of atom
   • mass number
     • number of protons + neutrons
   • atomic number
     • number of protons

6. isotopes

   • have different number of neutrons