crossword about the periodic table

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Across
  1. 3. elements that conduct electricity and heat
  2. 5. letters representing elements
  3. 6. basic unit of the periodic table
  4. 8. negatively charged particle
  5. 10. neutral particles in an atom
  6. 12. highly reactive metals in group 1
  7. 13. positively charged particle in an atom.
  8. 14. horizontal rows in the table
Down
  1. 1. has to do with salt
  2. 2. metals in the center of the table
  3. 4. gas stable gases like helium and neon
  4. 7. elements that do not conducts well
  5. 9. vertical columns in the table
  6. 11. reactive elements in group 17
  7. 12. related to atoms