1. The Atom, Periodic Table, and Chemical Reactions Mrs. Hooks Unit 3

2. Learning Targets 1. I can identify and describe the parts of an atom. 2. I can use the Periodic Table to explain characteristics of individual elements. 3. I can develop and use a model to describe how the total # of atoms does not change in a chemical reaction and thus mass is conserved.

3. Famous Scientist 1. Democritus – Discovered the Atom 2. John Dalton – Came up with the Atomic Theory – Billiard Ball Model 3. J.J Thompson – Discovered the Electron – Plum Pudding Model 4.Rutherford Discovered the Nucleus Nuclear Model 5.Niels Bohr Theory of Atomic Structure- Electrons are located in “Energy Levels”. Bohr Model 6. LaVoiser Law of Conservation of matter “Matter cannot be created or destroyed, it only changes forms”

4. Parts of the Atom Atom- small particle that makes up matter Subatomic Particles – 1. Proton- positively charged particle Located in the nucleus Equals the atomic number of an Element – 2. neutrons- particle with NO charge Located in the nucleus # of neutrons + # of protons = atomic mass – 3. Electrons- negatively charged particle Located outside the nucleus on Energy Levels # of Electrons = # of Protons Energy Level