Across
- 2. has no charge
- 4. most likely location in electron cloud
- 5. average of the masses of the existing isotopes of an element
- 8. the smallest particle of an element
- 9. number of protons in a nucleus
- 10. has a negative charge
Down
- 1. central core of an atom
- 3. a substance that cannot be broken down into any other substance
- 6. anything that has mass and takes up space
- 7. have a positive charge