year 9

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Across
  1. 2. particles contained in an atom that occupy shells
  2. 5. fractions are separated according to ______________ point
  3. 9. a method for breaking long chain hydrocarbons into short chains
  4. 11. if an ink does not move from the start line it is ______________
  5. 12. the section of the periodic table an element belongs to, decided by the number of shells
  6. 13. hydrocarbons contain carbon and hydrogen __________
Down
  1. 1. a method of separating mixtures of inks
  2. 3. one of the fractions that is used for jet fuel
  3. 4. the number of electrons that can be contained in the first shell of an atom
  4. 6. the area of an atom that is positively charged
  5. 7. the longest chain fraction used for building roads and roofs
  6. 8. the positively charged particles in an atom
  7. 10. the section of the periodic table an element belongs to, decided by the number of electrons on the outer shell