Atoms and the Periodic Table

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