Across
- 2. a subatomic particle that has a positive charge
- 4. a measure of a body or a region in a 3-D space
- 7. smallest unit of a substance
- 8. subatomic particle that has no charge
- 10. a substance that cannot be separated or broken down
Down
- 1. smallest unit of an element
- 3. anything that has mass and takes up space
- 5. matter can only be transformed
- 6. a subatomic particle that has a negative charge
- 9. atom's central region