Across
- 3. symbols and formulas to describe a reaction
- 7. stated electron orbit the nucleus
- 9. signs of a chemical reaction
- 12. beginning substances in a chemical reaction
- 13. discovered the nucleus has a positive charge
- 14. atomic number of six
- 15. proposed the Plum Pudding model
Down
- 1. has twenty protons
- 2. another sign of a chemical reaction
- 4. number of protons and neutrons
- 5. mass is neither created or destroyed
- 6. orbit the nucleus and have almost no mass
- 8. has 10 electrons
- 10. proposed that the atom is indivisible
- 11. substances created in a chemical reaction