Across
- 3. when the valence electrons become balance the atom becomes
- 4. when two or more elements come together and form
- 7. pushing force
- 9. pulling force
- 10. when two elements chemically bond
- 11. center of an atom
Down
- 1. negatively charged subatomic particles
- 2. type of electrons on the outermost layer
- 5. types of particles that make up an atom
- 6. positively charged subatomic particles
- 8. building blocks of the universe