1																	2
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4
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	7								8									9
10																							11
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	22
23									24
	25

Across 3. number of protons in an atom 4. substances that are made of one type of atom 7. positivly charged atom 8. elements that have characteristics of metals and nonmetals 10. vertical columns in the periodic tabble 12. P1V1/T1=P2V2/T2 13. AB+CD-->CB+AD 16. P1/T1=P2/T2 18. tiny structures that make up matter 19. he drew the first periodic table 20. horizontal rows on the periodic table 23. measure of temp. for gases 24. V1/T1=V2/T2 25. every element has one (two letters)

Down 1. A+O2-->CO2+H2O 2. AB-->A+B 5. shows the elements organized by property 6. P1V1=P2V2 9. A+BC-->B+AC 11. elements that give off particles 14. elements that are made in a lab 15. poor heat conductor (dull and brittle) 17. A+B-->AB 21. most elements are this at room temperature 22. conduct heat and electricity