Across
- 5. Number of protons
- 8. the smallest part of an element
- 9. a positive charge found in the nucleus
- 11. A smallest part of a compound
- 12. another word for impure
- 13. has only one type of atom
Down
- 1. Impure substance, combination of compounds and elements
- 2. a negative charge found in the shells of an atom
- 3. another word for pure
- 4. the relation of mass compared to something
- 6. number of protons and neutrons
- 7. 2 or more elements which are chemically combined on a fixed ratio
- 10. a neutral charge found in the nucleus