Chemistry

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