Across
- 3. a negatively charged particle orbiting the nucleus
- 5. has the symbol "O".
- 8. a substance made of atoms with the same number of protons
- 10. the center of an atom
Down
- 1. anything that occupies space and has mass.
- 2. a positively charged particle in the nucleus
- 4. a particle with no charge in the nucleus
- 6. space occupied by an object
- 7. the smallest unit of a chemical element
- 9. the amount of matter in an object.