1. 8/31/15 Practice: Exit: Starter: Atomic Theory 8/31/15 Atomic Theory Application: Fold and Glue notes here when done ProtonsNeutronsElectronsDistinct Nucleus Electron cloud Bohr Rutherford Dalton Thomson Cloud model Connection: Paste Chart Here Pick an atomic theorist, If they were alive today, what would you ask them? 9 10 At which point can you no longer see the objects with your eyes? Which tools would help magnify things? Glue paper here when done p 39 EQ: How has scientific research impacted the atomic model?

2. Agenda 1. Starter 2. Practice 3. Notes 4. Connection 5.Exit

3. DateLecture/ Activity/ Lab Page 8/28 Syllabus /Notebook Guidelines 1-2 8/28 Periodic Table/ Formula 3-4 8/28 Tools/ Measurement 5-6 8/28 Lab Report/ Investigations7-8 8/31 Atomic History/Theorist 9-10 Table of Contents

4. Practice Powers of 10

5. Application: Atomic Theory Exit YearScientistTheoryDiagram Democritus Dalton Thomson Rutherford Bohr Lewis Shrodinger Chadwick Present day Draw this chart on your paper; will glue afterward

6. The History of the Atom

7. The Beginning of the Atom

8. Early Models of the Atom Democritus 460 BC- 370 BC Universe was made of empty space and tiny bits of stuff Called these tiny bits of stuff atomos Atoms could not be divided

9. Early Models of the Atom Dalton Early 1800’s All elements are composed of indivisible particles. Atoms of the same element are the same Atoms of different elements are different. Compounds consisted of atoms of different elements combined together

10. Dalton’s Model of the Atom He believed the atom was a solid sphere An analogy to his atom would be…

11. Early Models of the Atom Thomson 1906 Plum pudding model Atom made of a positively charged material with the negatively charged electrons scattered through it.

12. An American analogy to his atom would be… Plum Pudding is an English dish sort of like bread pudding with raisins in it. …Is like… But we’ll still refer to it as the “Plum Pudding” model in class

13. Early Models of the Atom Rutherford 1909 Mostly empty space Small, positive nucleus Contained protons Negative electrons scattered around the outside

14. Example of Rutherford’s Atom

16. Early Models of the Atom Bohr 1913 Electrons move in definite orbits around the nucleus

17. Lewis Dot Structure 1916 Recognized that not all electrons in an atom play a role in chemical bonding The outermost electrons of an atom, called the valence electrons are chemically important.

18. Erwin Shrodinger 1924 - Austrian physicist; developed the electron cloud model Electron Cloud Model Proposed by Erwin Schrodinger

19. Erwin Shrodinger His Theory:  The exact path of electrons cannot be predicted.  The region referred to as the electron cloud, is an area where electrons can likely be found.

20. James Chadwick 1932 - English physicist; discovered neutrons His Theory:  Neutrons have no electrical charge.  Neutrons have a mass nearly equal to the mass of a proton.  Unit of measurement for subatomic particles is the atomic mass unit (amu).

21. Modern Model of the Atom The electron cloud 1920’s Sometimes called the wave model Spherical cloud of varying density Varying density shows where an electron is more or less likely to be

22. Connection: Check which of these applies to each Theorist ProtonsNeutronsElectronsDistinct Nucleus Electron cloud Bohr Rutherford Dalton Thomson Cloud model

23. Exit Pick an atomic theorist. If they were alive today, what would you ask them?

24. 8/31/15 Practice: Exit: Starter: Atomic Theory 8/31/15 Atomic Theory Application: Fold and Glue notes here when done ProtonsNeutronsElectronsDistinct Nucleus Electron cloud Bohr Rutherford Dalton Thomson Cloud model Connection: Paste Chart Here Pick an atomic theorist, If they were alive today, what would you ask them? 9 10 At which point can you no longer see the objects with your eyes? Which tools would help magnify things? Glue paper here when done EQ: How has scientific research impacted the atomic model?