Across
- 2. metal
- 6. helium
- 8. iron
- 9. weight
- 11. positive charge
- 12. number of protons
- 14. who created the periodic table?
- 16. sodium
- 17. collection of protons
- 18. baking soda
- 19. electric charge
Down
- 1. group of atoms bonded together
- 3. poles
- 4. gasses
- 5. a bunch of elements
- 7. neutral charge
- 10. team
- 12. building blocks of matter
- 13. Sn
- 15. negative charge