Across
- 3. Negative charge
- 5. neutral charge
- 6. list of elements
- 7. building blocks
- 10. gases on the periodic table
- 11. H
Down
- 1. a substance that cannot be broken down
- 2. Positive Charge
- 4. an abbreviation of an element
- 8. something that is hard
- 9. not a liquid or solid
- 12. a path of electrons orbiting the atom