Periodic Table Crossword Puzzle

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Across
  1. 2. This element is in every living thing
  2. 4. The least reactive member of the alkali metals
  3. 6. The smallest particle that has properties of an element
  4. 10. An element that has an abnormal amount of neutrons
  5. 11. A pure substance that cannot be broken down into simpler substances by chemical or physical means
  6. 12. The group of elements that are not reactive at all
  7. 13. The most simple element there is
  8. 16. The center of an atom
  9. 17. Last name of the creator of the Periodic Table
  10. 19. A subatomic particle that has a positive charge
Down
  1. 1. A horizontal row of elements in the Periodic Table
  2. 3. The densest Transition Metal
  3. 5. An element that has properties of both metals and nonmetals
  4. 7. A subatomic particle that has a neutral charge
  5. 8. The rarest naturally occurring element
  6. 9. The number of protons in an element's nucleus (2 words)
  7. 14. A subatomic particle that has a negative charge
  8. 15. This element makes up about 80% of the atmosphere
  9. 17. The only Transition Metal that is liquid at room temperature
  10. 18. What most of the elements are