Atoms and the Periodic Table

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