Across
- 4. two or more elements not chemically combined
- 6. negative charge
- 10. two or more elements chemically combined
- 11. a grid like structure of atoms
- 12. positive charge
Down
- 1. two or more atoms chemically combines
- 2. byproduct of iron oxide forming
- 3. atomic number 1
- 5. unique atom
- 7. makes up over 70% of air
- 8. neutral charge
- 9. single atom