Across
- 3. has neutral charge
- 5. has negative charge
- 7. The smallest part of an element
- 9. has positive charge
- 10. contains only one type of atom
- 11. the smallest part of a compound
- 13. the mass of a particle
Down
- 1. an impure substance containing different elements
- 2. number of protons in an atom
- 4. contains more that one type of atom
- 6. 2 or more elements which are chemically combined with a fixed ratio
- 8. a pure substance that only contains one type of atom
- 12. number of protons and neutrons in an atom