Across
- 4. Number of protons and neutrons
- 5. Positive charged atom
- 7. Number of protons in element
- 10. Antonym for pure
- 11. Negative charged atom
- 12. Heterozygous substance containing elements, compounds etc
- 13. Neutrally charged atom
Down
- 1. Many elements chemimcally combined together
- 2. Homozygous substance containing 1 type of atom
- 3. Mass compared to everything else
- 6. Smallest part of element
- 8. Smallest part of compound
- 9. Synonym for pure