Across
- 1. Atoms combined that are of two or more different elements
- 5. A particle in an atom's nucleus with negative electrical charge
- 7. The stuff that makes up matter
Down
- 2. When two or more atoms join together chemically
- 3. A particle in an atom's nucleus with neutral charge
- 4. A particle in an atom's nucleus with positive electrical charge
- 6. When all the atoms that make up a substance are the same kind
- 8. The stuff that makes up everything in the universe