Periodic Table Crossword Puzzle

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Across
  1. 3. The table that lists the elements and their information
  2. 5. The negative charge of an atom
  3. 6. The mass of an atom on the periodic table
  4. 9. The chemical combination of atoms
  5. 13. 8 protons, neutrons and electrons, group 16
  6. 14. 6 protons, neutrons and electrons, group 14
  7. 15. The combination of two or more elements
  8. 17. State of matter, seperated with no pattern, takes the shape of container
  9. 18. The neutral charge of an atom
  10. 19. State of matter, tightly packed, retains its shape
  11. 20. 79 protons, neutrons and electrons, group 11
Down
  1. 1. Elements that are solid in nature
  2. 2. Grouped of unreactive gases
  3. 4. Make up everything
  4. 7. Number of protons in an atom
  5. 8. The positive charge of an atom
  6. 10. The combination of two or more unique elements
  7. 11. 1 proton, neutron and electron, group 1
  8. 12. The chemical separation of atoms
  9. 16. State of matter, close together and the takes shape of container