Across
- 1. odorless unreactive gas that forms about 78% of the atmosphere
- 7. any of the fundamentally negatively charged particules in the outermost region
- 10. a chemical element that is in between a metal and a nonmetal
- 11. one of the most widly used metals
- 12. the quantity of matter contained in the atom of an element
- 16. the number of a chemical element arranged in the table
- 18. metal element with the symbol cu
- 19. subatomic particle with a neutral charge
Down
- 2. an element or substance that is not metal
- 3. a mineral involved in body processes, like healthy bones
- 4. a part or aspect of something
- 5. subatoic particles that occur in all atomic nuclei, with a positive charge
- 6. a column in the period table of chemical elements
- 8. a thing that represents or stands for something else
- 9. bonding interaction involving a hydrogen atom
- 13. a column of elements on the periodic table
- 14. any substance composed of identical molecules
- 15. class of substancescharacterized by high electrical conductivity
- 17. nonmetal element used in charcoal and coal