periodic table crossword puzzle

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Across
  1. 2. a solid material that is typically hard, shiny
  2. 5. what do you do when you touch a hot stove
  3. 6. Dmitri Mendeleev made it
  4. 9. an element or substance that is not a
  5. 12. a subatomic particle of about the same mass
  6. 13. a stable subatomic particle occurring in all
  7. 14. Gases any of the gaseous elements helium, neon,
  8. 15. the total number of protons in a nucleus
Down
  1. 1. an element (e.g. arsenic, antimony, or tin)
  2. 3. people or things that are located close
  3. 4. the number of protons found in the
  4. 7. the basic unit of a chemical element
  5. 8. a stable subatomic particle with a charge
  6. 10. the total mass of the protons ,neutrons
  7. 11. nuclei, with a positive electric charge
  8. 13. A length or portion of time