Across
- 5. is the law of mass
- 6. are on the outer levels of a atom
- 7. start before a chemical reaction
- 10. result from a chemical reaction
Down
- 1. end after chemical reaction
- 2. is the positive part of the nucleus
- 3. are the negative part of the nucleus
- 4. does not create new substances
- 8. is the horizontal rows in a periodic table
- 9. are the vertical columns in a periodic table