Across
- 2. number below an element symbol
- 4. a small particle that makes up matter
- 6. chart with elements
- 9. same element with different neutrons
- 11. protons+nuetrons
- 12. positively charged subatomic particles
Down
- 1. 3 particles that make an atom
- 3. anything that has matter takes up space
- 5. particles with no charge
- 7. negatively charged particles
- 8. positively charged central part of an atom
- 10. anything that has mass and takes up space