Periodic Table of Elements

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Across
  1. 2. around the nucleus
  2. 3. metal+metal
  3. 4. non-metal+non-metal
  4. 5. the mass of an atom expressed in atomic mass units
  5. 8. created the Periodic Table
  6. 12. holds quarks together
  7. 13. metal+non-metal
  8. 14. tiny piece of everything
  9. 15. zero charged particle
  10. 17. in the middle of an atom
  11. 18. has the same number of protons
  12. 20. positively charged particle
Down
  1. 1. a unit of mass that describes the mass of an atom or molecule
  2. 6. makes up everything in the universe
  3. 7. number of protons of an atom
  4. 9. the sum of the numbers of protons and neutrons in the nucleus of an atom
  5. 10. negatively charged particle
  6. 11. the number of groups in the Periodic Table
  7. 16. an atom
  8. 19. a charged atom