Across
- 4. Requires energy to occur.
- 9. Positively charged particles.
- 10. Chemical symbols representing an element.
Down
- 1. Negatively charged particles.
- 2. Negatively charged ion.
- 3. A material is changed into different properties with new substances.
- 5. A reaction happens when chemical bonds give off heat.
- 6. A group of atoms bonded together
- 7. Positively charged ion.
- 8. Basic building blocks of life.