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Across 1. electrons in the outter most energy level 5. when a pair of electrons is shared between two atoms in order to follow octet rule 7. breaks down into two or more substances 9. deca. 11. a single element replacment another element in a compound 12. C+273 14. H 17. a model of molecular motion used to explain the properties of gasses 18. A+B-->AB 19. calcium carbonate 20. Planetary modle 21. P1/T1=P2/T2

Down 2. nothing is created nor destroyed 3. forms between metal and nonmetal 4. the cation and anion of two diffrent compounds switches placements 6. P1V1=P2V2 8. a representation of a chemical equation 10. how many of each molecule you have in an eqation 13. stuff you make 15. VI/TI=V2/T2 16. are atoms or groups of atoms with a charge 18. every element has one or two of these