Across
- 5. A compound that contains two hydrogen atoms and one oxygen atom.
- 6. Substance made of one type of atom
- 9. : A substance made from more than one element
- 12. You get this from the air that you breathe
- 14. When elements join together
Down
- 1. Collection of letters used to represent an element, not always the same as the name
- 2. Common name for sodium chloride
- 3. An element found everywhere especially in living things
- 4. Metal which used to be used in pipes
- 7. Piece of scientific equipment used to look at small objects
- 8. Substances which are not chemically combined
- 10. Something a substance does
- 11. Scientist famous for his atomic model
- 13. An expensive metal
- 15. : A tiny particle which makes up everything