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Atomic Models throughout History: Greek to Modern

Explore the four main atomic models developed from ancient Greek times to the present, including Plum Pudding, Bohr, Electron Cloud, and Nuclear models.

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Atomic Models throughout History: Greek to Modern

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  1. Ch 3 The ATOM Final

  2. 100 Atomic ModelName the apparatus used to discover the electronAnswer

  3. Atomic Model 100 Cathode ray tube

  4. 200 Atomic ModelThomson’s discovery of the electron led to his development of what atomic model?Answer

  5. Atomic Model 200 Plum Pudding Model

  6. 300 Atomic ModelWhat conclusion can be drawn from the fact that most of the alpha particles passed straight through the foil in the Gold Foil Experiment?Answer

  7. Atomic Model 300 An atom is mostly empty space.

  8. 400 Atomic ModelWhat conclusion can be drawn from the fact that some of the alpha particles were deflected by (bounced back from) the foil in the Gold Foil Experiment?Answer

  9. Atomic Model 400 Answer Atoms have a small, dense, positive nucleus.

  10. 500 Atomic Model Draw diagrams and explain the 4 main atomic models from Greek times to present. Answer

  11. Atomic Model 500 AnswerIndivisible Plum Bohr ElectronSphere Pudding (Planetary) Cloud

  12. 100 ScientistsName the scientist who used the Oil Drop Experiment to determine the charge on an electron.Answer

  13. Scientists100 Answer Millikan

  14. Scientists 200 Answer • Discovered and named two new elements. • First woman to earn a Nobel Prize. • First person to win 2 Nobels. • Established use of X-Rays in WWI.

  15. 200 Scientists • Describe two of Marie Curie’s unique accomplishments as a scientist. Answer

  16. 300 ScientistsName the discoverer of the neutron.Answer

  17. Scientists 300 James Chadwick

  18. 400 ScientistsDescribe two corrections to Dalton’s 1808 Atomic Theory.Answer

  19. Scientists 400 Answer • Atoms are divisible (they are made of smaller particles) • Atoms of same element can have different masses (isotopes) • Atoms can be created and destroyed (nuclear chemistry)

  20. 500 ScientistsName the scientists credited with the discovery of radioactivity.Explain how this discovery changed the idea of the “indivisible” atom.Answer

  21. Scientists 500 Answer Henri Becquerel, Marie Curie, Pierre Curie The fact that something can be emitted from the atom indicated that it must have subatomic particles.

  22. 100 Nuclear ChemWrite the nuclear symbols for an alpha particle and a beta particle.Answer

  23. Nuclear Chem 100 Answer • Alpha particle • Beta particle

  24. 200 Nuclear Chem • What type of radioactive decay results in energy only being emitted from the nucleus? Answer

  25. Nuclear Chem 200 • Gamma radiation

  26. 300 Nuclear ChemWrite the nuclear chemical equation for the beta decay of rubidium-90. Answer

  27. Nuclear Chem 300 Answer

  28. 400 Nuclear ChemWrite the nuclear symbol of the new element produced when Neptunium-237 (Np) undergoes alpha decay.Answer

  29. Nuclear Chem 400 Answer

  30. 500 Nuclear ChemWhat scientist discovered the nucleus of the atom and later the proton?What was his/her country of origin?Answer

  31. Nuclear Chem 500 Ernest Rutherford of New Zealand

  32. 100 Particles Name the particle that has about the same mass as a proton but no electric charge.Answer

  33. Particles 100 Answer Neutron

  34. 200 ParticlesWrite the complete nuclear symbol for the particle that has 48 protons64 neutrons46 electronsAnswer

  35. Particles 200 Answer

  36. 300 ParticlesGive the number of protons, neutrons and electrons in potassium-40.Answer

  37. Particles 300 Answer 19 protons 21 neutrons 19 electrons

  38. 400 ParticlesGive the number of protons neutrons and electrons for the most abundant isotope of B3-Answer

  39. Particles 400 5 protons 6 neutrons 8 electrons

  40. 500 Particles Name the force which holds together the particles in the nucleus.Explain why it is strange to us.Answer

  41. Particles 500 Nuclear ForceIt is strange because like charges usually repel, yet many positive charges are held together in small space.

  42. 100 PotpourriHow many atoms are in 7.8 x 10-3 moles of zinc?Answer

  43. Potpourri 100 Using Avogadro’s number as the conversion factor: ? Atoms = 7.8 x 10-3mol X 6.02 x 1023 atoms mol = 4.7 x 1021 atoms

  44. 200 PotpourriHow many moles are there in 50.5 g of neon?Answer

  45. Answers for Potpourri 200 Using molar mass of Ne = 20.18 g/mol ? Mol = 50.5 g x 1 mol = 2.50 mol 20.18 g

  46. 300 PotpourriName the two main regions of the atom.Which region occupies most of the volume of the atom.Which region has most of the atom’s mass?Answer

  47. Potpourri 300 • The two regions are the nucleus and the electron cloud. • The electron cloud constitutes most of the volume of the atom and is mostly empty space. • The nucleus contains most of the atom’s mass.

  48. 400 Potpourri A reaction between 46 g of sodium and 71g of chlorine will produce how much salt?Answer

  49. Potpourri 400 Answer 117 g (Law of Conservation of Mass)

  50. 500 PotpourriGive chemical formulas of two compounds which support the Law of Multiple Proportions.Answer

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