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Across 1. v1/t1=v2/t2 3. positively charged part in the atom 8. diagram to show how many valence electrons there are 9. no charge in atom 13. a carbon based compound reacts with oxygen to form carbon dioxide,co2,and water 14. p1x v1=p2xv2 15. single element replaces another element in a compound 17. substance are made of one kind of atom 19. electrons in the outer shell 21. p1/t1=p2/t2 22. p1x v1/t1=p2xv2/t2 23. 2 or more substances combine to form a single substance 24. negatively charged ions

Down 2. number of protons in an atom 4. positively charged ions 5. he drew the first periodic table 6. rv=rnt 7. a single compound breaks down in 2 or more simpler substances 10. high melting point 11. the cations and anions of 3 different compounds switch places 12. low melting point 16. tiny structures that make up all matter 18. elements that have characteristics of both metals and non metals 20. negatively charged part in the atom