Chapter 4

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Across
  1. 3. positive mass at the center of the atom
  2. 5. Lightest element on the periodic table
  3. 6. the possible energies that electrons in an atom can have
  4. 7. negative subatomic particle
  5. 9. the number of protons in an atom
  6. 11. Element Fe on the periodic table
  7. 12. Element K on the periodic table
  8. 13. neutral subatomic particle
  9. 14. the first scientist to contribute to atomic theory
  10. 15. atoms of the same element with a different number of neutrons
  11. 16. scientist who discovered neutrons
Down
  1. 1. the number of protons and neutrons in the nucleus of an atom
  2. 2. this model is sometimes called the planetary model and places electrons on various energy levels outside the nucleus
  3. 4. Element 17 on the periodic table
  4. 7. visual model for the most likely location of electrons in an atom
  5. 8. positive subatomic particle
  6. 10. scientist who discovered the existence of electrons