1. Chemistry Unit 2 Jeopardy Historical Discoveries Structure of the Atom Ions and Isotopes Using the Periodic Table (atomic #, mass #, # electrons, # protons, # neutrons, etc.) Isotope Notation 100 200 300 400 500

2. John Dalton Who came up with the “four postulates” of atomic theory?

3. 1,2 Who discovered the nucleus? Ernst Rutherford

4. 1,3 Who came up with the “plum pudding” model of the atom? J.J. Thomson

5. 1,4 Who proposed that electrons could only orbit at certain energy levels? Neils Bohr

6. 1,4 Whose discovery led to the discovery of the electron “cloud”? Erwin Schrodinger

7. 2,1 The compact, dense center of the atom is called ___________ The nucleus

8. 2,2 Where are electrons located? Electron cloud

9. 2,3 What discovery fixed the “problems” in Heisenberg’s and Schrodinger’s atomic mass calculations? The discovery of the neutron

10. 2,4 Which subatomic particle exists only in a state of probability (until you make an observation)? The electron

11. 1,4 In order to jump up in energy levels, an electron needs to absorb what? A photon

12. 3,1 What is an ion? An atom that has gained or lost electrons

13. 3,2 What is an isotope? An atom that has gained or lost neutrons

14. 3,3 What is the ionic charge of an atom that has lost 3 electrons? +3

15. 11 protons, 12 neutrons, 10 electrons How many protons, neutrons, and electrons are in this sodium atom?

16. Will these two ions attract each other, repel each other, or have no effect on each other. Why? Repel each other—because they are both positively charged

17. 4,1 How many protons does helium have? 2

18. 4,2 How many neutrons does beryllium have? 5

19. 4,3 How many electrons does a -2 ion of oxygen have? 10

20. Uranium-235 is an isotope of Uranium (U). How many neutrons does it have? 235 – 92 = 143 neutrons

21. 1,4 Can you have a +2 hydrogen ion? Explain how/why No, because hydrogen only has 1 proton so there’s no way you can have two more protons than electrons.

22. 5,1 What is the isotope notation for a neutral helium atom?

23. What is the isotope notation for an iron (Fe) atom (atomic mass 56) that has gained an electron?

24. 5,3 What is the isotope notation for carbon-14 that has lost an electron?

25. What is the isotope notation for a helium atom that has an extra neutron and lost an electron?

26. What’s the isotope notation for a sulfur atom that has gained a proton? If it gained a PROTON it aint sulfur anymore, fools!