Periodic Crossword Puzzle

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Across
  1. 3. substance that cannot be broken down or change
  2. 7. subatomic particle with a negative electrical charge
  3. 8. does not conduct electricity or heat well, is not hard or malleable
  4. 10. arrangement of the chemical elements in rows and columns
Down
  1. 1. subatomic particle with a positive electrical charge located in the nucleus
  2. 2. nonmetalic element that has some metal characteristics
  3. 4. column of elements on the periodic table with similar properties
  4. 5. the number of protons in the nucleus
  5. 6. subatomic particle with a neutral electrical charge located in the nucleus
  6. 9. can conduct electricity and heat, are very shiny, strong, hard, and malleable