Across
- 4. chemical reaction in which heat is released
- 5. states the matter is neither created not destroyed
- 6. verticle column on the periodic table
- 8. metals and non-metals on the zigzag
Down
- 1. electron on the outermost energy level
- 2. chemical reaction that requires an input of energy
- 3. reaction to hold atoms together
- 7. horizontal row on the periodic table