Periodic Table Crossword

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Across
  1. 4. mix of both metals and nonmetals
  2. 6. substance made up of only 1 type of atom
  3. 7. verticle columns
  4. 10. traits that can be seen without altering the substance
Down
  1. 1. horizontal rows
  2. 2. poor conductors of heat/electricity, dull
  3. 3. good conductors of heat/electricity
  4. 5. first element on the periodic table
  5. 8. how shiny something is
  6. 9. if it is this property, it doesn't break easy