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Across 2. on the periodic table Pb, Ag, Au and Cu are examples 6. Cl-35 and Cl-37 are _________________ of chlorine 7. underlying reason for a series of related observations 9. HCl is an example 10. an ion with a positive charge 12. the physical state of bromine at room temperature 13. O2 is an example of a ________________molecule 15. what is not in the nucleus of an atom? 18. Hitting the bullseye every time is an example of ____________ 19. what type of gases are neon and argon? 20. The common name for Hg2(+2) 23. density is an example of an ___________________ property 24. does not compress significantly 25. sand in water is an example of this type of mixture 26. a common example of a crystalline solid (helps to cool tea)

Down 1. On the periodic table fluorine is an example 3. unit of measure for time 4. temperature scale where water freezes at 273 degrees. 5. sulfuric acid and nitric acid are examples 6. hydrogen cyanide contains 3 atoms. How many sig figs are there for this number? 8. BaCl2.6H2O is an example 11. shorthand way to write aqueous in a chemical reaction 14. On the periodic table silicon and germanium are examples 16. the name for the reaction of a hydrocarbon with oxygen 17. the name of one of the isotopes of hydrogen 21. Gypsum is calcium sulfate dihydrate. How many anions does it contain? 22. 6.02 x 10(+23) atoms equals one _____________