1		2			3		4				5			6
																									7
									8		9										10
		11
				12						13				14											15
16																		17
							18
																		19
20									21
									22
						23														24								25
			26											27
																			28
			29									30
																31									32
																								33
34																	35
														36
								37
			38																39
																40
		41						42				43
																			44		45
				46
												47
		48

Across 3. which period number has its highest energy electrons in the 5th energy level 7. only liquid metal 8. group 17 elements 13. the modern PT lists the elements according to this property 16. first man to arrange elements based on atomic number 17. type of semiconductor that has an extra electron 18. elements #89-103 19. he grouped elements in groups of 3 called triads 20. group 18 elements 22. the flow of electrons will produce an _________ 26. metalloid in group 15 27. the outermost energy level of radium 28. elements in groups 3-12 29. group 2 metals 31. Cu, Ag, and Au were titled the ____ metals 33. Li, Na, and K belong to this group of metals 34. tendency to recur at regular intervals 35. element commonly used in transistors and diodes 36. element in group 6 period 6 38. particle accelerators produce ____ elements 40. horizontal row 42. only 2 elements exist as ____ 44. the second energy level hold ____ electrons 46. one of the liquid elements 47. element in group 10 period 4 48. one of the elements that Mendeleev predicted the properties of before it was discovered

Down 1. metals tend to _____ the VE and become positively charged 2. the first element of the third period 4. the number of ____ can be used to predict properties and structure 5. its function is to increase the strength or amplify electric signals 6. vertical column 9. elements #57-71 10. the period number is equal to the outermost _______ 11. the first periodic tables arranged elements in such a way that elements with similar properties were in the same ____ 12. Cl, Br, and I belong to the _____ 14. elements in the bottom two rows of the PT 15. element in period 5 that has 2 VE 16. elements in groups 1-2, 13-18 21. elements that conduct electricity under certain conditions 23. have some properties of metals and some properties on nonmetals 24. one of the properties of the noble gases 25. he was able to predict the existence of elements that had not been discovered yet 29. early periodic tables had elements arranged according to _____ 30. the middle element of the triad had a mass that was the ____ of the top and bottom element 32. group 1 metals 34. physical and chemical properties of the elements repeat in a regular pattern when arranged by atomic number 36. the first period has ___ elements 37. one of the elements not arranged by atomic mass, because properties did not match up 39. it is made of a n-type and a p-type semiconductors 40. type of semiconductor that has a positive charge 41. addition of a small amount of another element to a crystal of a semiconductor 43. halogen in period 5 45. nonmetals tend to _____ the VE and become negatively charged