Periodic Table of Elements

1234567891011121314151617
Across
  1. 1. zero charged particle
  2. 2. a charged atom
  3. 4. easily combined
  4. 6. positively charged particle
  5. 7. the sum of the numbers of protons and neutrons in the nucleus of an atom
  6. 8. non-metal+non-metal
  7. 10. a unit of mass that describes the mass of an atom or molecule
  8. 14. metal+metal
  9. 15. around the nucleus
  10. 17. metal+non-metal
Down
  1. 1. in the middle of an atom
  2. 2. an atom that has the same number of protons
  3. 3. tiny piece of everything
  4. 5. created the Periodic Table
  5. 9. makes up everything in the universe
  6. 10. number of protons of an atom
  7. 11. the mass of an atom expressed in atomic mass units
  8. 12. holds quarks together
  9. 13. negatively charged particle
  10. 16. the number of groups in the Periodic Table