Across
- 1. negatively charged
- 4. smallest part of the world
- 5. side to side on the periodic table
- 8. outermost electrons
- 10. group of atoms bonded together
- 11. found with electrons
- 12. up and down on the periodic table
Down
- 2. composed of different elements
- 3. basic building blocks of life
- 6. positively charged
- 7. charge is neutral
- 9. found with protons and neutrons