Across
- 3. how the elements are organized
- 5. number of protons in a nucleus atom
- 7. element or material that is not a metal
- 9. observation of atoms of main group
- 10. horizontal rows on periodic table
Down
- 1. a solid material usually shiny and hard and malleable
- 2. electron associated with an atom
- 4. mass of a chemical element
- 6. a group of atoms bonded together
- 8. vertical columns on periodic table