Across
- 3. This element is a halogen with 45 neutrons
- 5. The atomic mass of this element is 40
- 9. this element is in group 18 and has 10 protons
- 10. This element is a non metal and has 17 protons
- 11. This elements symbol is Na
- 12. this element has the symbol Ar
- 13. this element has 9 electrons
- 15. this element is found at period 7 group 2
Down
- 1. this element is a metal in the transition metals family and has 27 electrons
- 2. The atomic number of this element is 3
- 4. This element is on period 2 and is a metalloid
- 6. This element is a alkaline earth metal with 12 neutrons
- 7. This element is on period 1 group 18
- 8. This element has 34 protons
- 14. This element has 36 electrons