Ch4-Electrons In Atoms

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Across
  1. 3. Not used in the modern atomic model but once described an electron path around the nucleus
  2. 4. A small component of matter
  3. 8. ____Mass The weighted average mass of the naturally occurring isotopes of an element
  4. 9. ____Particle - A particle smaller than an atom such as a proton neutron or electron
  5. 11. ____Theory - The scientific explanation of the nature of matter based on experiments
  6. 12. A positively charged subatomic particle found in the nucleus
  7. 14. ____Foil Experiment - Experiment showing that atoms contain a small dense nucleus
  8. 16. Scientist who discovered the electron using cathode ray experiments
  9. 18. ____Charge - The type of charge carried by electrons
  10. 21. The electrical property of a particle that may be positive negative or neutral
Down
  1. 1. ____Force - The force of attraction or repulsion between electrically charged particles
  2. 2. ____Charge - The type of charge carried by protons
  3. 5. The smallest particle of an element that retains the properties of that element
  4. 6. ____Ray - A stream of electrons produced in a vacuum tube
  5. 7. A neutral subatomic particle found in the nucleus
  6. 10. The isotope used as the standard for atomic mass measurements
  7. 13. The small dense positively charged center of an atom
  8. 15. Scientist whose gold foil experiment led to the nuclear model of the atom
  9. 17. Having no overall electrical charge
  10. 19. Abbreviation for atomic mass unit
  11. 20. An atom that has gained or lost electrons and carries a charge