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