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	12
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Across 3. any ion carrying a positive charge 5. energy possesed by a substance by virtue of its motion 8. atom in which the number of electrons does not equal the number of protons 9. any pure substance that cannot be broken down into two or more different simple substances. 10. number of protons in the nucleus of an element's atom 11. smallest piece of an element that can exist and still exhibit the properties of that element. 12. joules of heat required to raise the temperature of 1 g of a substance by one degree C or K 13. region of space surrounding the nucleus of an atom in which there is a high probability of finding up to two electrons 14. type of chemical bond formed by the sharing of electrons between two atoms. 15. chemical bond in which two atoms share two pairs of electrons 18. elements that combine with metals and other nonmentals,poor conductors of heat,and brittle. 19. small dense region at the center of an atom containing nearly all the mass of the atom 20. elements with a high luster,good conductors of electricity, and ductile. 23. method of expressing the chemical bonds among atoms in a molecule using lines to repesent the bonds. 24. subatomic particle with no chage located in the nucleus 25. energy possesed by a substance by virtue of its position in space or its chemical composition 26. matter that is uniform in composition and properties throughout the sample 27. homogeneous mixture involving two or more substances; composition can be varied within limits. 28. changes that result in changes in the composition of the substance 29. all changes in a substance other than changes in its chemical composition 31. the attractive forces that hold atoms together as compounds 32. subatomic particle with a charge of +1 existing inside nucleus 33. chemical bond formed by transfer of electrons from atom to atom. apositive and negative charged ion are held together. 34. heterogeneous matter composed of two or more pure substances, each of which retains its identity and specific properties

Down 1. method of expressing the covalent bonds among atoms in a molecule using the octet rule and dots to represent bonds 2. matter that is not uniform in composition and properties throughout the sample, rather two or more distinct sunbtances unequally distributed. 4. an arbitrarily assigned value of exaclty 12 amu for an atom of carbon-12. 6. any pure substance that can broken down by chemical means into twop or more different simple substances 7. subatomic particle with a relative charge of -1; existing outside the nucleus 11. any ion carrying a negative charge 16. smallest particle of a pure substance that can exist and undergo chemical changes. 17. degree to which an atom attracts a pair of covalently bonded electrons to itself. 19. special type of nonmetal which are nonreactive 21. elements that lie on the colored stair step line with both metallic and nonmetallic properties. 22. any ion made up of more than one atom 30. any atom having the same atomic number as number of protons but different mass