Chemistry
Across
- 3. Before a chemical reaction take place.
- 6. a stable subatomic particle with a charge of negative electricity
- 7. anything that has mass and takes up space.
Down
- 1. After a chemical reaction takes place
- 2. each side of the equation has the same number of atoms
- 4. a subatomic particle of about the same mass as a proton
- 5. a stable subatomic particle occurring in all atomic nuclei