Across
- 4. electric charge is neutral
- 6. smallest particle of an element
- 7. number number of protons in the nucleus
- 8. a mixture of two elements
- 10. electric charge is positive
Down
- 1. table A table of elements
- 2. mass the mass of an atom
- 3. electric charge is negative
- 5. a pure substance
- 9. a combination of two or more compounds