1. 1. Who demonstrated lightning is electric? 2. Father of the periodic table = GET YOUR NOTES OUT!!! Day 2 11-15-11

2. 1.Put the three people / events in chronological order (first to last): Dalton, discovery of the electron, Democritus Day 3 11-16-11

3. Jigsaw  11 minutes to write group notes!  Rest of the period to share with other groups.

4. Do NOT eat yet!!! 1. You are allowed to eat this cookie in chem. because it represents _______________ model. In which the chocolate chips represent ____________ and the rest of the cookie represents ____________. Day 4 11-17

5. Jigsaw Review and keys Chronological order

6. Atoms defy what we thought we knew! 1902 Ernest Rutherford and Frederick Soddy discovered that radioactivity produces new __________ Nuclear decay of uranium- 238 elements

7. 238 U → + 4 He 92 2 234 90 Th uranium-238 → thorium-234 + α particle Atomic # Mass #

8. Mass # = protons + neutrons Atomic # = protons – periodic table Write the nuclear symbol for Carbon with 6 neutrons Write the nuclear symbol for Carbon with 8 neutrons

9. Write the nuclear symbol for Boron with 6 neutrons F 9 19 The atom of fluorine represented below: Protons = Neutrons = Atomic number = Mass number = 9 10 9 19

10. 1. Draw the nuclear symbol for bromine-80. atomic # = protons = mass # = neutrons = Day 5 11-18

11. What does the inside of an atom look like and how do we know? Day 5 11-18

12. Atoms defy what we thought we knew! 1909-1910 Ernest Rutherford’s –Experiment applet #1Experiment applet #1 –Experiment applet #2Experiment applet #2

13. Ernest Rutherford’s Atom’s appearance: –____________________ –____________________________________ –________________________________ Hollow sphere Dense center with positive charge Electrons occupy empty space

14. Atoms defy what we thought we knew! 1912 - 1913 Neils Bohr - modified Rutherford’s atomic model. –Electrons are located in _______ ______ ______. Used this model to explain _________ __________ energy levels emission spectra specific

15. Atoms defy what we thought we knew! 1912 - 1913 Neils Bohr - modified Rutherford’s atomic model. –When an electron becomes excited (gains energy) it can jump up to a new energy level. When it falls back down to its ground state it emits energy (light).

16. Atoms defy what we thought we knew! 1913 Frederick Soddy coined the term _______ –Atoms of the same ________ –Differ in ____ –Differ in ___________ –Examples ________________________ _________________________ isotope element mass radioactivity Carbon-12 and Carbon-13 Uranium-236 and Uranium-238

17. Atoms defy what we thought we knew! 1913 Henry Moseley –Assigned ______ ________ to each element –Realized that something in the _______ of an atom determines … atomic numbers nucleus

18. Atoms defy what we thought we knew! 1913 Henry Moseley –Realized that something in the _______ of an atom determines its position on the _______ _____. nucleus Periodic Table

19. 1. Draw the nuclear symbol for carbon-14. atomic # = protons = mass # = neutrons = Day 6 11-21

20. What does the inside of an atom look like and how do we know? Day 6 11-21

21. Atoms defy what we thought we knew! 1919 Ernest Rutherford discovered _______ –Carry a _______ charge and are found in the ______. –The number of _______ is the atom’s ______ _______. protons positive nucleus protons atomic number

22. Atoms defy what we thought we knew! 1926 Neils Bohr’s ________model of the atom –_–______ _____ –_–_______ is dense center with ______ _______ –_–________ found in specific energy levels quantum Empty sphere Nucleus protons Electrons positive

23. Neils Bohr’s ________model of the atom –________ found in specific energy levelsquantum Electrons Atoms defy what we thought we knew! 1926

24. Atoms defy what we thought we knew! 1932 James Chadwick discovered _________ –Have no _______ –Located in the atom’s _______ neutrons charge nucleus

25. 3( ) Atoms defy what we thought we knew! 1938 Lise Meitner was the first to correctly describe a nuclear ________ reaction in which a large nucleus is split into two smaller nuclei of approximately equal size. 235 U + 1 n → → 141 Ba + 92 Kr + fission 920 5636 236 92 U 1 0 n 236 92 U

26. Today: Is matter continuous or discontinuous? What are protons, neutrons, and electrons made of? What about string theory? quarks, bosons, muons, gluons, etc! Is there a tiniest piece of energy that everything is made of?

27. Today: Is matter continuous or discontinuous? When you ask “What is the smallest piece?”, be certain to specify what you want! –Cmpd. = –Element = –Atom = Is there a tiniest piece of energy that everything is made of? group of bonded atoms single atom ??

28. Parts of Atoms, Isotopes, and Ions Isotopes –Atoms of one element Same number of _______ Different numbers of ________ Different ______ protons neutrons masses

29. Parts of Atoms, Isotopes, and Ions Ions –________ atoms that have gained or lost ________ –Examples Iron loses 2 electrons Chlorine gains 1 electron Charged electrons Fe +2 Cl -1

30. Assignment # 1 Unit 3 MAKE UP WORK!!! Assignment: #s 26, 27, 30, 31 on page 119