1. Who was Democritus? What did he do? WARM UP Read p 212-214

2. Matter Matter – anything that has mass and takes up space. Matter is made up of MUCH smaller particles known as atoms. Matter – anything that has mass and takes up space. Matter is made up of MUCH smaller particles known as atoms.

3. Atoms Atoms are the smallest unit of matter. Mostly empty space. Nucleus has protons (+) and neutrons (=) Outside flying around the nucleus are the electrons (-) http://www.brainpop.com/science/matterandchemistry/atomicmodel/

4. Sodium Na

5. More ways… Called Lewis Dot Structure https://www.you tube.com/watch ?v=o-3I1JGW-Ck

6. Elements An element is matter made of one type of atom. 90 elements are commonly found on the Earth. There are more than 20 synthetic (man-made) elements and even more to come http://www.youtube.com/watch?v=d0zION8xjbM We put them on a “table” to keep them organized!

7. ATOMIC # (PROTONS) ATOMIC MASS (protons +neutrons) Atomic Symbol Element Name

8. Atomic # (PROTON # & ELECTRON #) Atomic Mass (Protons + Neutrons) Atomic Mass – Atomic # = NEUTRONS

9. Iron (Fe)-- in nails for building Aluminum (Al)-- in coke cans Lithium (Li) --in watch batteries Gold (Au)-- in microprocessors, jewelry Copper (Cu)-- in coinage Zinc (Zn) --in galvanized steel, food Oxygen (O)-- in air Nitrogen (N)-- also in air Hydrogen (H) --in water, the Sun Neon (Ne)-- in signs Uranium (Ur)-- in power production Sulphur (S)-- in matches and food preservation Nickel (Ni)-- component of steel Tungsten (Tn) -- incandescent light filaments Silicon (Si) -- all sorts of glass, sand Common Use for Elements

10. Need more… http://10.214.3.241/SAFARI/montage/play.php?keyindex=98125&location=005849&filetypeid=54 http://www.youtube.com/watch?v=xd4-Uy2FLWc