Across
- 4. the basic building block of chemistry. Proton, neutron and electron
- 6. physical material from which something is made
- 7. particles close to one another and neatly ordered
- 9. made up of only one type of atom
Down
- 1. formed when two or more elements are chemically combined
- 2. particles close to one another and randomly organised
- 3. a tiny bit of matter that makes up everything
- 5. particles not close together and randomly organised
- 8. potential or kinetic
- 10. made when elements and/or compounds are mechanically mixed together