Across
- 4. is a pure substance
- 6. mass difference between masses
- 8. 2 or more elements
- 10. a mixture of different compounds
- 12. pure substance
Down
- 1. smallest part of an element
- 2. neutral charge
- 3. positive charge
- 4. negative charge
- 5. impure substance
- 7. number number of protons
- 9. number number of protons and neutrons
- 11. smallest part of a compound