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

Across 3. average atomic mass of 7 amu 4. lightest element on periodic table 8. average atomic mass of oxygen 9. has one less proton than calcium 13. has 53 protons 14. alkaline earth metal in period 4 16. heaviest alkali metal 18. would have 7 electrons when neutral 20. chemical symbol is Sn 21. has 9 protons 22. usually has 5 neutrons 24. group vanadium is in 25. group 4 and period 4 26. average atomic mass of 12 amu 28. 26 protons 30. has one more proton than nickel 31. chemical symbol is Pb 32. chemical symbol is Au 33. has one more proton than phosphorus 34. noble gas in period 3 36. atomic number of neon

Down 1. group 17 period 3 2. heaviest element in period 5 5. 14 protons 6. lightest noble gas 7. has an average atomic mass of 65 amu 10. located below boron on the table 11. atomic number 25 12. period 4 group 17 15. the second element down in group 4 17. heaviest alkaline earth metal 19. valuable metal below copper on the table 21. period nickel is in 23. also the name of a planet and in period 6 group 12 25. period number of phosphorus 27. lightest element in group 16 29. lightest element in period 3 33. number of protons in carbon 35. number of protons in a hydrogen atom