A Few Famous Names and Atomic Concepts

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Across
  1. 2. First scientist to propose that the earth revolves around the sun
  2. 4. A negative particle that exists in energy levels around the nucleus
  3. 6. Developed the modern atomic theory
  4. 11. A champion of the Copernican view of the earth who was severely persecuted by the church
  5. 13. French scientist who developed the law of conservation of matter
  6. 15. Associated with the discovery of the nucleus
  7. 16. an atom with equal number of protons and neutrons
  8. 18. an atom that has lost or gained an electron.
  9. 19. Greek philosopher who believed that matter was made of earth wind fire and water
  10. 20. French scientist who discovered that gasses react in small whole number ratios (hyphenated name)
Down
  1. 1. A nuclear particle with a positive charge
  2. 3. A nuclear particle that determines the identity of an atom
  3. 5. the particle that is lost or gained in chemical reactions
  4. 7. Found that cathode rays were electrons
  5. 8. Greek philosopher who developed an early theory of atoms
  6. 9. Used charged oil drops to determine the charge on an electron
  7. 10. A neutral particle in the nucleus that only affects the atomic mass.
  8. 12. Practitioner of primitive science during the dark ages.
  9. 14. Discovered that electrons can only exist at specific energies around the nucleus
  10. 17. the sum of the protons and neutrons