1. Atoms What is an atom? http://learn.genetics.utah.edu/content/cells/s cale/ http://learn.genetics.utah.edu/content/cells/s cale/ How did we discover the atom? What do we already know about it?

2. History of the Atom Democritus Dalton JJ Thompson Rutherford Bohr Other Scientists

3. Group Presentations 3 minutes to get with group Research the assigned scientist and their contribution to our knowledge of the atom Fill out the table about your scientist Make a poster representing that information 20 minutes – present to class

4. Short Cartoon about History of Atom TED Ed Talk on Size of the Atom

5. Thompson Veritasium: Thompson's Cathode Ray Experiment Veritasium: Thompson's Cathode Ray Experiment

6. Rutherford Rutherford Gold Foil Experiment Animation

7. Jan. 14 Warm Up In labbooks, answer the following questions: 1.Who was the first to think of a particle so small it could not be divided anymore? DEMOCRITUS 2.Who discovered protons? RUTHERFORD 3.Who used a glass tubing to find electrons? THOMPSON 4.What does Bohr’s model most closely represent? PLANETARY MODEL

8. Review Crash Course Video: History of the Atom

9. So how far have we come?

11. Bohr Model – Model to describe atom

12. Arrangement of Atoms 100+ atoms, how do we organize them? How could we organize them?

14. Interactive Periodic Tables http://www.rsc.org/periodic-table http://www.ptable.com/

15. Reading Element Square --------------------------------atomic number (Z); # of protons --------------------------------atom symbol --------------------------------atomic mass (# of P + # of N)

16. Atomic Number Atomic number (Z) Atomic number (Z) of an element is the number of protons in the nucleus of each atom of that element.

17. Mass Number Mass number Mass number is the number of protons and neutrons in the nucleus of an isotope. Mass # = p + + n 0

18. Drawing the Atom

19. Practice Which element has 4 protons? Which element has a mass of 65 amu? Which element has the symbol Ag? Give an example of an element that has a full energy shell How many electrons does N have? How many neutrons does Ca have?

20. Practice Drawing Atoms H He Li Be B C N O F Ne Na