1. WARM UP “Shoot for the moon. Even if you miss, you’ll land among the stars.” 1.What does this mean to you? 2.What are your goals for 2 nd quarter, in Chemistry, other classes, or other activities?

2. The Big Bang Theory

3. History of the Periodic Table

4. History Triads –1817 – Johann Dobereiner –Groups of 3 elements Similar properties Proportional atomic masses

5. History Chemical Symbols –1828 Jons Jacob Berzelius –Element (O) and compound (H 2 O) symbols

6. History Law of Octaves –1864 – John Newlands –Arranged elements by atomic mass Every 8 th had similar properties

7. History Early Periodic Tables –1869 - Lothar Meyer –Proposed a table to organize elements by atomic mass

8. History Early Periodic Tables –1869 - Dmitri Mendeleev –Table in atomic mass order 66 elements Grouped on properties! –Predicted existence of unknown elements

10. History Modern Periodic Table –1913 - Henry Moseley –Periodic table in order of atomic number

11. Modern Periodic Table

12. WRAP UP List 3 reasons elements have been organized/grouped near each other on the Periodic Table.