Across
- 5. - Compound of aluminum and oxygen
- 6. - Change from one state to another
- 11. - Blue-green gemstone
- 12. - Electromagnetic radiation that is visible
- 13. - Taken in by a substance
- 14. - Able to be seen
- 16. - Compound of oxygen and another element
- 17. - Study of the composition and properties of substances
- 18. - Exposing to radiation
- 19. - Made by human skill or labor
- 20. - Precious minerals used in jewelry
Down
- 1. - The color or pigmentation of something
- 2. - Regions around the nucleus where electrons are likely to be found
- 3. - Transition metal element used in pigments
- 4. - Shape with eight faces
- 7. - Relating to the nucleus of an atom
- 8. - Having a particular hue
- 9. - Transition between different oxidation states
- 10. - Emission of energy as electromagnetic waves
- 15. - Mineral containing silicon and oxygen