Atoms and the Periodic Table

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Across
  1. 3. left to right on the periodic table
  2. 6. in group 17, period 5
  3. 7. atomic # is 2
  4. 9. has the symbol Al
  5. 10. the groups to the left of the metalloids
  6. 13. negative charge in the nucleus
  7. 14. group known as halogens
  8. 16. up and down on the periodic table
  9. 18. positive charge in the nucleus
  10. 20. neutral charge in the nucleus
  11. 24. created the Bohr model
  12. 25. a small nucleus surrounded by electrons
Down
  1. 1. atomic # is 12
  2. 2. has 4 protons
  3. 4. has 30 neutrons in the nucleus
  4. 5. Number of protons found in the nucleus
  5. 8. in group 7, period 4
  6. 11. has 47 protons
  7. 12. in group 13, period 4
  8. 14. group known as the noble gases
  9. 15. The smallest unit of matter
  10. 17. has 12 neutrons in the nucleus
  11. 19. the groups to the right of the metalloids
  12. 21. has 45 protons
  13. 22. Average of the isotopes of that element
  14. 23. has the symbol H