Across
- 6. positively charged center
- 8. Elements want 8 in their outer shell
- 10. Basic chemical unit
- 12. Chemical reactions that release heat or light
- 13. two or more chemically bound atoms
- 14. Second generation of quarks
- 15. Electrons in the outer shell
- 19. Third generation of quarks
- 21. First generation of quarks
Down
- 1. Holds quarks together
- 2. Gain's or losses electrons
- 3. Made of one substance
- 4. Negative charge
- 5. Chemical reaction that makes the air cold around it
- 7. Shares electrons
- 9. Process of removing electrons from an atom to from ions
- 11. Many free electrons
- 16. no charge
- 17. Made of more than one substance
- 18. Positive charge
- 20. Particles that make up Neutrons and Electrons