Chapter 3

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Across
  1. 3. Gamma rays originate here
  2. 4. X-rays originate here
  3. 5. The smallest particle of matter that has all the properties of an element
  4. 8. Positive particle of the atom
  5. 10. Mendeleev created this
  6. 13. Alpha and beta particles are types of ____ radiation
  7. 15. The removal of an orbital electron from an atom
  8. 16. The first civilization, on record, to theorize about the atom
  9. 17. Neutral particle of the atom
  10. 18. He is known for creating the eye-and-hook atomic model
  11. 19. The number of protons plus the number of neutrons is the atom’s _____
  12. 20. The smallest particle of a compound
Down
  1. 1. Atoms that have the same atomic number but different atomic mass
  2. 2. X-rays and gamma rays are types of _____ radiation
  3. 6. He is known for the plum pudding atomic model
  4. 7. He created the solar system atomic model we use today
  5. 9. The number of protons in an atom decides the atom’s _____
  6. 11. No outer shell can contain more than _____ electrons
  7. 12. Negative particle of the atom
  8. 14. Atoms of various elements combine to form structures called