Across
- 2. positively charged subatomic particle
- 3. number of protons
- 6. negatively charged subatomic particle
- 8. a mixture of different compounds
- 9. smallest part of an element
- 10. a substance with the same number of protons
Down
- 1. number of protons and neutrons
- 4. two or more atoms chemically bonded together
- 5. two or more elements chemically combined together in a fixed ratio
- 7. neutrally charged subatomic particle