The periodic table and atoms crossword

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Across
  1. 2. relating to atoms
  2. 4. a particle with a positive charge
  3. 5. the horizontal numbers that label vertical rows
  4. 9. a particle with a neutral charge
  5. 10. everything on the periodic table
  6. 13. the noble gas with the lowest atomic mass
  7. 14. the particle that makes up matter
  8. 15. the letters that abbreviate the element they are placed on
Down
  1. 1. a particle with a negative charge
  2. 3. a group of atoms that are together
  3. 6. the vertical numbers that label horizontal rows
  4. 7. the elements on the periodic table that aren't metals
  5. 8. an element with 20 electrons
  6. 11. the elements on the periodic table that are metals
  7. 12. the thing in the center of the atom