Periodic Table Crossword

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Across
  1. 2. used in televison sets and lasers
  2. 3. causes cancer
  3. 4. the number of electrons present in the outermost energy shells
  4. 6. can treat cancer, but also kill you
  5. 8. a statistical chart consisting of date points plotted on a fairly simple scale
  6. 9. a central figure in the development of the atomic theory of the universe
  7. 10. highly radioactive
  8. 14. cloud a group of electrons circulating around a nucleus or a molecule
  9. 16. any of the elements fluorine, chlorine, bromine, iodine, and astatine
  10. 18. is about the same mass as a proton
  11. 19. a stable subatomic particle occurring in all atomic nuclei
Down
  1. 1. a table of the chemical elements arranged in order of atomic number
  2. 5. any group of rare gases that include helium, neon, argon, krypton, and xenon
  3. 7. the number of protons in the nucleus of an atom
  4. 11. two or more forms of the same element that contain equal numbers of protons but different number of nuetrons
  5. 12. the basic unit of a chemical element
  6. 13. any group of subatomic particles
  7. 14. a stable subatomic particle
  8. 15. the structure in a cell that contains the chromosomes
  9. 17. vital for the human body