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

Across 2. electromagnetic radiation travels in this form 6. most of the mass of an atom is found here 7. known for the law of definite proportion 10. number of protons and neutrons found in the nucleus of an atom 11. discovered the electron 13. negative electrode 15. he said electrons orbit positive nucleus like rings around Saturn 17. isotopes have a different number of this subatomic particle 18. 1/12 the mass of a carbon-12 atom 22. positive electrode 24. explanation based on observations and supported by many results 29. motion of elections is similar to planets orbiting the sun 30. waves can transfer ____ from place to place 32. distance between corresponding points on consecutive waves 34. he said the world is made of empty space and tiny particles 35. fact of nature observed so often it is accepted as truth 36. like charges will do this when in contact 37. testable prediction that explains your observations

Down 1. smallest part of matter 3. outermost electrons 4. atoms of the same element but with different mass numbers 5. proposed atomic theory 7. the identification of the electron led to the discovery of this particle 8. spectrum of light released from excited atoms of an element 9. mass of _____ = mass of products 12. made measurements of chemical reaction in sealed containers 14. unit of frequency 16. he proposed that electrons have enough energy to keep them in constant motion around the nucleus 18. idea that matter is made of particles called atoms 19. the number of protons in an atom 20. his experiments led to the discovery of the nucleus 21. one of the two properties of electromagnetic radiation 23. electrons can only move around the nucleus at distances that correspond to the correct amount of ___- 25. using 5 senses to gain information 26. number of vibrations per second of a wave 27. the metal piece at each end of a cathode ray tube 28. most of an atom is made of this 31. because of the law of conservation of matter, we know that in natural processes, atoms are ____ 33. proposed that matter is a combination of 4 elements