Periodic table key words

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Across
  1. 1. quantity of matter an object contains
  2. 4. horizontal row
  3. 7. negatively charged
  4. 8. how much mass is contained within a given volume
  5. 11. something made from a single atom
  6. 12. vertical coloumn
  7. 13. a shiny object
Down
  1. 2. fixed shape and volume
  2. 3. neutral charged
  3. 5. the things atoms sit on
  4. 6. to a degree to which something is reacitve
  5. 9. a letter on the periodic table
  6. 10. positivly charged