Across
- 4. properties that becomes clear during or after a chemical reaction.
- 5. helps indicate elemenets
- 9. Periodic table of
- 10. help scientists to make stuff such as vaccines
- 12. scientist trained the study of chemistry
- 13. vertical column
Down
- 1. chemical reacting
- 2. person who developed the PTOE
- 3. chemical groups
- 6. uses periodic table of elements
- 7. horizontal row
- 8. number of protons in the nucleus
- 9. a abbreviation
- 11. Protons and Neutrons