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