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 2. This element has the chemical symbol Si 4. This element is the basis of all life on earth 9. Anything that has mass and takes up space 10. Positively charged sub atomic particle 12. This element has 3 protons and 3 neutrons 13. Often used to fill up balloons 16. This element has 18 electrons 17. The first element in the periodic table 18. This element has the chemical symbol K 19. The atomic __________ determines the position of an element in the periodic table 22. The name of an element when it becomes radioactive 26. Foil is made from this 29. Elements can be represented by chemical _________ 31. This element has 9 electrons 32. Discovered the nucleus of an Atom using gold foil and radioactive particles 33. The Atomic _________ of an element is the number of protons plus neutrons 35. The name for different forms of the same element 36. Negatively charged sub atomic particle

Down 1. Noble or inert gas used in glowing signs 3. The central part of an atom containing neutrons and protons 5. __________ table of elements 6. This element has 5 electrons 7. The symbol of this element is S 8. This element has an atomic number of 7 11. The element we need to breathe 14. This element has the chemical symbol Be 15. This element has an atomic mass of 31 20. The current model for an atom known as an electron ___________ 21. JJ Thompsom proposed the plum __________ model of the Atom 22. An element becomes ______________ when it has more neutrons than protons and becomes unstable 23. Pure substance containing one type of atom 24. Neutral sub atomic particle 25. We get this element that makes our bones strong from milk 27. This element has an atomic number of 12 28. This element has 17 protons 30. This element has the chemical symbol Na 34. This is made up of protons, neutrons and electrons