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