1									2
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		4											5					6							7
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			9		10							11					12					13	14
		15																		16
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						19				20
21																22										23
								24				25
	26				27
							28								29								30
31															32			33
					34						35
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								38							39								40		41
42									43											44										45
					46						47	48
																		49
			50
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52								53													54
55												56								57

Across 2. Ni 4. event that occurred in space that may have scattered heavy naturally occurring elements through the universe 5. because the number of electrons equals the number of protons, atoms are electrically _____ 7. Pb 10. a particle accelerator uses this type of field to accelerate the particles 12. number of quarks 13. atoms of a given element are ____ in size, mass, and properties 15. number of protons 17. Au 19. Mg 21. vertical column 25. weighted average mass of all naturally occurring isotopes 28. he said electrons travel in fixed orbits 29. a positive ion 30. Na 31. Cu 32. 8 elements with properties between metals and nonmetals 34. elements found on top right of the PT 36. Zn 38. Xe 39. Hg 41. horizontal rows 44. atoms of same element with different number of neutrons 46. Sn 47. the Tevatron is in this state 49. the Large Hadron Collider is in this country 50. Br 52. different atoms combine in simple whole-number ____ 53. repeated in a pattern 54. elements in the same group share similar ______ 55. scientist that proposed that atoms are indivisible and indestructible 56. S 57. Russian chemist, arranged the first periodic table

Down 1. Be 2. neutral subatomic particle 3. Ba 6. Philosopher that proposed matter was uniform throughout 8. F 9. Li 11. each letter or pair of letters, abbreviation for an element 14. Greek philosopher that proposed the idea that atoms are tiny particles that make up all matter 16. area around the nucleus with a high probability of finding an electron 18. total number of protons and neutrons 20. negative subatomic particle 22. Mn 23. device that shoots charged particles to break apart protons 24. Cr 26. positive subatomic particle 27. Cl 33. property Mendeleev used to create first PT 35. a negative ion 37. smallest particle of an element that retains the elements properties 39. a particle accelerator uses this type of field to accelerate the particles 40. he proposed that all positive charge of an atom was concentrated in a nucleus 42. Ag 43. English scientist, arranged PT using atomic number 45. elements found on the left and middle of the PT 46. his model consisted of a positive mass with negative particle embedded into it 48. example of this particle is an electron 51. small particle that makes up protons and neutrons