Across
- 3. mass divided by volume
- 4. beginning substances in a chemical reaction
- 6. when the appearance of a substance changes
- 7. the atomic number of an element
- 10. another sign of a chemical reaction
- 11. mass divided by volume
- 12. when the atoms rearrange to form a new substance
- 13. the center of the atom
- 14. symbols and formulas to describe a reaction
- 15. discovered the nucleus has a positive charge
Down
- 1. proposed the Plum Pudding model
- 2. substances created in a chemical reaction
- 5. proposed that the atom is indivisible
- 8. has 10 electrons
- 9. when the atoms rearrange to form a new substance