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Developing Models of Matter (Section 3.2)

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  1. 3. Antoine Lavoisier identified __________ as a mixture of oxygen and another gas.
  2. 5. Dalton's atomic model states that each ___________ is characterized by the mass of its atoms.
  3. 6. Thomson’s atomic model states that electrons have a _________ mass and a negative charge.
  4. 11. 1650 – Robert Boyle believed the four element model could be improved. He defined element as “certain simple _______________ bodies”.
  5. 13. Henry ____________ discovered that his gas would burn in oxygen and produce water.
  6. 16. Rutherford’s Atomic Model states that rapidly moving negatively charged electrons are scattered __________ the nucleus.
  7. 17. 1831 – Michael Faraday found that electric current could cause _____________ changes to some compounds.
  8. 18. A.D. 500-1600 – The _______________ devised chemical symbols for substances (now elements and compounds).
  9. 20. 350 B.C. – Aristotle also believed in the ________ element model and it influenced scientific thinking for almost 2000 years.
  10. 21. 450 B.C. – Greek scholar Empedocles proposed that matter was composed of four elements: earth, air, fire,___________.
  11. 22. Robert ____________ recognized that elements could be combined to form compounds.
  12. 25. Ernest Rutherford made the “nuclear” model and discovered the existence of a dense, positively charged core in the atom called the ____________.
  13. 27. In 400 B.C., ________________ suggested that matter was made of tiny particles called atoms that could not be broken down further.
  14. 31. Bohr’s atomic model states that the __________ of filling the first three orbits with electrons is 2, 8, and 8.
  15. 32. Michael _____________ believed that atoms could gain electric charges and form ions.
  16. 34. electrons have a negative charge and the rest of the atom is a sphere of ___________ charge.
  17. 35. Rutherford’s Atomic Model states that the nucleus is a very tiny, __________ and positively charged core of an atom.
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  1. 1. Bohr’s atomic model states that electrons move around the nucleus in circular paths called _________, like the planets circle the Sun.
  2. 2. Dalton’s model of the atom was called the “_____________ Ball” Model
  3. 4. Bohr’s atomic model states that each electron in an orbit has a definite amount of __________.
  4. 7. Bohr’s atomic model states that electrons cannot exist between these orbits, but can move up or down from one orbit to another if ____________ by heat, light or electrical energy.
  5. 8. J.J. Thomson formed the “__________ bun” model where the atom is a sphere of positive electricity with negative electrons imbedded in the positive sphere.
  6. 9. 1808 – John Dalton proposed that the atom is a solid, _______________, indestructible sphere and the atom contains no subatomic particles.
  7. 10. Niels Bohr made the “_______________” model by placing electrons in specific orbits around the nucleus.
  8. 12. Dalton's atomic model states that atoms are not ____________ or destroyed in a chemical change.
  9. 14. 1904 – J.J. Thomson discovered very light negative particles called _____________.
  10. 15. Bohr’s atomic model states that electrons are more ____________ when they are closer to the nucleus.
  11. 16. Late 1700’s – Joseph Priestly was the first person to isolate ____________.
  12. 19. Dalton's atomic model states that joining atoms of two or more elements forms _____________.
  13. 23. Bohr’s atomic model states that each orbit (energy level) is located at a certain _____________ from the nucleus.
  14. 24. Rutherford’s Atomic Model states that the nucleus is surrounded by mostly ___________ space.
  15. 26. Antoine Lavoisier defined element as a pure substance that ____________ be broken down into simpler substances. He discovered and identified 23 elements.
  16. 28. Rutherford’s Atomic Model states that all of the atom’s positively charged particles called ___________ are contained in the nucleus.
  17. 29. Bohr’s atomic model states that further the electron is from the nucleus, the ___________ its energy.
  18. 30. Dalton believed that atoms of the same element are exactly alike and have the same _________.
  19. 33. Henry Cavendish experimented by mixing metal with ________ which produced a flammable gas (hydrogen).