Unit #2: Atomic Theory & Structure

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Across
  1. 2. Rutherford discovered that the atom has a small, positive, dense nucleus through his
  2. 4. How many significant figures are there in the value 9405.000210
  3. 7. Bohr’s proposal that electrons orbit the nucleus like planets around the sun was
  4. 11. Groups 3B to 2B comprise the
  5. 12. Leading zeros are [blank] significant figures
  6. 13. Which group/family is indicated if it is gray, hard, brittle, and has high melting and boiling points?
  7. 15. Henry Moseley was an Englishman who corrected Mendeleev and created a periodic table according to the
  8. 16. The only particle that will appear on the reactant side of an equation is when an [blank] occurs
Down
  1. 1. This Russian chemist published the first periodic table arranged according to atomic mass and is known as the “Father of the Periodic Table”
  2. 3. Ions are formed in reflection of a change in the number of
  3. 5. Through the Cathode Ray Tube Experiment, Thomson discovered that electrons are [blank] charged
  4. 6. Dalton’s theory that atoms were like a solid sphere
  5. 8. If I have 248.23 grams of Chlorine, how many moles is this? Round to the nearest thousandth, and exclude units.
  6. 9. What phase is Group 18 on the periodic table at 25°C and 1 atm?
  7. 10. Alpha particles can be stopped by
  8. 14. Silver exists in nature in two isotope, Ag-107 and Ag-109. If the atomic mass of silver is 107.87 amu, what is the percentage of abundance of the Ag-109 isotope? Round to the nearest tenth, and exclude units.