Atoms and the Periodic Table

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Across
  1. 2. subatomic particle that tells us about an atoms reactivity
  2. 6. this family of elements are highly reactive and usually appear in a gaseous state
  3. 8. a chemical substance that cannot be broken down into any other substance and keeps its chemical properties
  4. 10. elements are organized by their number of protons, or their __________________
  5. 12. a subatomic particle with a negative charge
  6. 15. a subatomic particle with a positive charge
  7. 17. describes an atoms ability to bond with other atoms based on the number of electrons in its outer most shell
  8. 18. the location of an atom's mass; particularly dense
Down
  1. 1. this family of elements are highly reactive and usually appear as soft, metallic solids
  2. 3. the location surrounding the center of an atom
  3. 4. used to classify elements that have similar chemical properties, including number of valance electrons
  4. 5. mainly found on the left and center of the periodic table
  5. 7. this family of elements are nonreactive (inert) and do not form bonds with other atoms
  6. 9. the basic unit of a chemical element
  7. 11. used to classify elements by the number of energy levels (electron shells/orbitals) they contain
  8. 13. a subatomic particle that has no charge
  9. 14. creates a "staircase" feature on the periodic table
  10. 16. mainly found on the right side of the periodic table