Across
- 4. A chart that organizes elements by their chemical properties
- 5. The region of an atom where electrons are found
- 6. The number of protons in an atom determines this
- 9. The center of an atom, made up of protons and neutrons
- 10. Positively charged particle in an atom
Down
- 1. a property of particles that can be positive or negative
- 2. The basic unit of matter
- 3. A substance made up of one type of atom
- 7. Negatively charged particle in an atom
- 8. A particle in an atom with no charge