Across
- 8. The abbreviation for elements
- 9. a negatively charged atom
- 11. When two liquids make a solid
- 12. the center of an atom
- 13. a group of atoms
- 14. a common metal with a lot of uses
- 16. contains two different atom stuck together
- 18. list of elements
- 19. particles are compact and barely move
- 20. has a unique atomic number
Down
- 1. occupies the highest energy levels in an atom
- 2. number of protons
- 3. added to pools to kill germs
- 4. was used in thermometers but was highly toxic
- 5. particles are closer and a little faster
- 6. Particles are free and go any where
- 7. is often used in electrical wires
- 10. a particle with no electric charge
- 15. gasses that don´t react much
- 17. a positively charged atom