Across
- 3. Letters and numbers showing the atoms to make a substance
- 5. process in which atoms rearrange to form new substances
- 8. Tiny pieces of matter that everything is made of
- 11. Something that helps us understand by making it easier to see
- 12. Negative pieces of an atom, outside the nucleus
- 13. Something that is made of atoms
Down
- 1. Positive pieces of an atom, in nucleus
- 2. The relative size of things
- 4. a starting substance that is part of a chemical reaction
- 6. A group of atoms joined together in a particular way
- 7. No charge, in nucleus
- 9. Something that can be observed in a substance
- 10. an ending substance that is made during a chemical reaction