Across
- 5. substance that can not be broken down
- 7. a neutral charge
- 8. C
- 9. list of elements sorted
- 10. the gasses on the periodic table
- 11. basic building blocks
- 12. number of protons in the atom
Down
- 1. H
- 2. the abbreviation of the element
- 3. a positive charge
- 4. the amount of electrons in the atom
- 6. a neutral charge