Across
- 3. all the elements on the staircase line between metals and non-metals
- 7. has a negative charge
- 9. discovered the atomic theory
- 11. the basic unit of matter
- 13. all the elements on the right side of the periodic table
- 14. have pH levels of more than 7
Down
- 1. can be identified by the number of protons
- 2. made up of atoms
- 4. reaction can result in a product
- 5. have pH levels of less than 7
- 6. has a positive charge
- 8. all the elements on the left side of the periodic table except hydrogen
- 10. has a neutral charge
- 12. the attraction between atoms or molecules