4. Parts and pieces People Laws and Postulates + - huh? Experiment s Radioactivi ty $ 200 $ 200$200 $ 200 $ 200 $400 $ 400$400 $ 400$400 $600 $ 600$600 $ 600 $ 600 $ 600 $800 $ 800$800 $ 800 $ 800 $ 800 $ 1000$1000 $ 1000 $ 1000 $ 1000 $ 1000

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6. Final Jeopardy Final Jeopardy Category

7. Final Jeopardy Rutherford proposed the nuclear or "solar system" model, in which negatively charged electrons move around a tiny, massive, positively charged nucleus. This model replaced Thomson's plum-pudding model, in which positive and negative charges were evenly distributed throughout the atom. Rutherford's gold-foil experiment (which showed that most alpha particles fired at a gold foil pass right through without deflection) led him to conclude that the atom is mostly empty space. The fact that a few of the positively charged alpha particles are deflected greatly indicated that a small part of the atom-the nucleus-contains all its positive charge and most of its mass. Compare Rutherford's model of the atom to Thomson's model by drawing their models. Label all the parts. Explain Rutherford's experiment to develop his model. (Click 3 times for answer.)

8. $200 atom The smallest particle of an element that retains the chemical identity of that element

9. $400 XGa p + 31 n 0 39 e 34 ? 70 x -3 P + = n o = X = e - = 31

10. $600 1, 0 What is the approximate atomic mass of a neutron and an electron, in amu?

11. $800 197 grams How many grams of gold would I need to have 1 mole of gold?

12. $1000 Ion and Isotope Unequal number of protons and electrons and a change in neutrons

13. $200 democritus Who discovered atomos

14. $400 Rutherford Discovered the core of the atom is positive

15. $600 Dalton Teacher who made 4 postulates

16. $800 Thomson This person used cathode rays to create the plum pudding model

17. $1000 Rutherford Called the core of the atom the nucleus

18. $200 Law of constant composition The law where carbon dioxide always contains 73 percent oxygen by mass is an illustration of

19. $400 Plumb pudding model A goo of positiveness with negative particles distributed throughout

20. $600 Electrons are outside a positive nucleus (came up with the term nucleus for the first time) Describes Rutherford’s model of the atom

21. $800 A=mass Z= atomic number In the model what does A and Z stand for?

22. $1000 Radioactive source, Beta, Gamma, Alpha What are a,b,c,d

23. $200 Spectral lines that indicated electrons traveled in specific orbits with specific # of electrons. Bohr discovered

24. $400 The electron Thomson (using a cathode ray ) discovered

25. $600 Ben Franklin The scientist who first suggested that the structure of atoms is related to electricity was

26. $800 neutrons Atomic number subtracted from Atomic mass

27. $1000 electrons What subatomic particle is equal to -3 if proton value is three less.

28. $200 2+ This is a charge of an alpha particle

29. $400 Atomic number An element's identity is based on its

30. $600 Strong force or strong nuclear force The force that holds protons together

31. $800 Towards the positive plate If electrically charged plates were placed above and below the cathode ray tube, in what direction, if any, would they deflect a beam of cathode rays?

32. $1000 From cathode to anode In the cathode ray tube shown operating in Figure 3-1, what is the general direction of the cathode ray beam? (hint: Cathode (-) and Anode (+))

33. $200 Helium atom with 2+ charge and mass of 4 Explain an alpha particle

34. $400 ANS: 210 = mass number of unknown + 4; mass number of unknown = 210 – 4 = 206 84 = atomic number of unknown + 2; atomic number of unknown = 84 – 2 = 82 Element 82 is lead (Pb), so the missing symbol is Pb Balance the following nuclear equation and write the missing symbol. Po —>X + He

35. $600 24 protons and 28 neutrons 21 electrons Using a periodic table, determine the number of protons, neutrons, and electrons in the ion.

36. $800 answer Balance the following nuclear equation. Be sure to give the symbol, with superscript and subscript, for the missing nucleus or particle:

37. $1000 Write a balanced nuclear equation for the beta decay

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71. The Jeopardy champion!