Chemistry

Chemistry

1. Elements

   • cannot be broken down by any chemical method
   • made up of tiny substance called atoms
   • placed on the periodic table
     • vertical columns: groups
       • Roman numarals
       • names of groups
         • group I: alkali metals
         • group II: alkali earth metals
         • group VII: halogens
         • group VIII: noble gasses
         • transitional metals
     • horizontal rows: period
       • normal numbers
     • division by ladder starts at Boron (B)
       • metals
         • all elements on the left EXCEPT HYDROGEN
       • non-metals
         • all elements on the right
     • Elements are placed according to the number of protons they have

2. atoms

   • building blocks to all substances
   • elements consist of only one type of atom
   • other substances are s combination of atoms
   • sub-atomic particles
     • protons
       • positively charged and found in the nucleas
     • neutrons
       • neutral particles found in the nucleas
     • electrons
       • negatively charged surrounding the atom
   • molecule: 2 or more atoms chemically bonded