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Name ________________ Honors Chemistry ___/___/___ Part I: Match the name on the right with the correct statement on the left. You will use some names more than once. 1. __________ His model of the atom is the Electron Cloud Model. A. Chadwick 2. __________ He discovered the nucleus. B. Millikan 3. __________ He put electrons into energy levels. C. de Broglie 4. __________ He developed the uncertainty principle. D. Heisenberg 5. __________ He said atoms of different elements have different properties. E. Planck 6. __________ He believed that matter is continuous. F. Einstein 7. __________ He discovered the electron. G. Thomson 8. __________ He discovered that the atom is mostly empty space. H. Schrödinger 9. __________ He used math to explain the location and energy of the electrons in an atom. I. Stoney 10. __________ He discovered the wave nature of the electron. J. Rutherford 11. __________ His model is called the quantum mechanics model. K. Democritus 12. __________ He discovered the neutron. L. Dalton 13. __________ He used polonium and gold foil in his famous experiment. M. Bohr 14. __________ He used a cathode ray tube to make his discovery. N. Aristotle 15. __________ He used the term “atomos” to describe an indivisible part at the base of all matter. 16. __________ He is the Father of the Atomic Theory. 17. __________ He designed a mathematical equation for the model of the atom. 18. __________ He determined the charge of the electron. 19. __________ He deduced the relationship between the energy and frequency of radiation. 20. __________ He proposed that light could be described as quanta of energy that behave as particles. Part II: Fill in all missing information. Isotope #p #n #e- mass # atomic # 2 1 symbol europium-151 202 60 157 Hg 146 102 Part III: Calculate the atomic mass. 1. The element boron is found to contain two naturally occurring isotopes. One isotope, boron-10, has a mass of 10.012937 amu and the other, boron-11, has a mass of 11.009305 amu. Determine the percent abundance of each isotope. Your answer must have four significant digits. You must show all work. 2. Determine the average atomic weight of zinc, given the following isotopes, their masses, and their abundances. You must show all of your work. Isotope Zinc-64 Zinc-66 Zinc-67 Zinc-68 Zinc-70 Mass 63.929 65.926 66.927 67.924 69.925 Abundance 48.63 27.90 4.10 18.75 0.62