Across
- 2. Substances made of two or more elements chemically joined
- 5. Two or more atoms joined together
- 6. A dry, sandy area with little rain
- 7. The smallest unit of an element
- 8. A negatively charged particle that orbits the nucleus
- 10. A neutral particle in the nucleus
- 13. The lightest element; a gas with symbol H
- 14. A building where people live
Down
- 1. People who study and experiment to learn new things
- 3. A gas that makes up most of the air
- 4. Near; not far away
- 5. A tool used to see very small things
- 9. The centre of an atom containing protons and neutrons
- 11. A gas we breathe that supports life
- 12. A positively charged particle in the nucleus