Atomic Matter

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Across
  1. 3. ________s have a negative charge
  2. 7. Element in period 2 with 4 electrons in its outer (valence) shell
  3. 9. _________s have a positive charge
  4. 11. Element in group 2 period 3
  5. 13. This is where you can find neutrons
  6. 14. Element with 7 neutrons
Down
  1. 1. The ____ number is the same as the no. of protons
  2. 2. Atomic number 29
  3. 4. Helium, Neon, Argon are all in group __
  4. 5. Beryllium, Magnesium, Calcium are all in group ___
  5. 6. Element with the electron configuration 2,8,1
  6. 8. Element in group 13 period 3
  7. 10. Atomic number 47
  8. 11. The number of protons + neutrons = _______ number
  9. 12. Element with the electron configuration 2,8,8