Across
- 3. the building blocks of science
- 4. subatomic particle with a charge of negative charge
- 6. a group of two or more atoms that form a substance
- 8. when something in science is physically mixed
- 9. when a molecule contains two or more atoms
Down
- 1. number 7 on the periodic table
- 2. anything that takes up space
- 5. a subatomic particle with no charge
- 7. number 26 on the periodic table
- 10. the odorless gas O2