Across
- 2. Shot out various kinds of atoms.
- 3. A molecule that is always found in the same ratio.
- 4. The building blocks of all life.
- 7. The combination of hydrogen and carbon atoms.
- 10. What everything on earth is made up of.
Down
- 1. microscope The only thing molecules can be seen with.
- 5. A well known example of an element with an atomic symbol of O. Humans use this to breathe.
- 6. Always set up in a specific way (ratio)
- 8. Bang The event that happened 300,000 years before the first molecules formed.
- 9. A group of two or more atoms that are bonded together.