Across
- 2. the _________ table of the elements
- 4. the smallest particle of an element
- 6. atom or molecule with an electric charge
- 8. groups of atoms
- 10. holds its shape
- 11. a gas we breathe to survive
Down
- 1. forms 92% of the sun
- 3. a poisonous gas
- 5. flows
- 7. a metal used in making salt
- 9. unique type of atom
- 12. expands to fill a space