Atoms

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Across
  1. 6. the number of protons in neculeus
  2. 7. made the periodic table
  3. 8. determine the atomic number
  4. 10. Electron shells formula
  5. 11. Atomic number is 1
  6. 12. over 100 elemnets
  7. 13. made up of protons and neutrons
  8. 14. 18 in vertical colums
  9. 15. numbered 1-7
Down
  1. 1. has a negative charge
  2. 2. react quickly with other elements
  3. 3. Atomic number is 6
  4. 4. Basic unit of matter
  5. 5. he founded atoms
  6. 9. contain either 1 or 2 letters