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Across 1. soft, silvery metal 3. substances that undergo reactions 7. element that keeps bones and teeth strong, blood clotting, found in fish and almonds 9. his experiments led to the law of conservation of matter 10. positive end of a cathode ray tube 12. group 17 metals 13. most abundant element in the universe 14. scientist that the atom had electrons orbiting a central positive nucleus 18. element to speed up action of enzymes, found in lentils and peas 20. capacity to do work 21. its function is to increase the strength or amplify electrical signals 23. when 2 or more substances combine to form a single product 24. measure of the amount of matter an object contains 26. substance that is doing the dissolving 27. vertical column 28. reaction in which energy is released 29. horizontal row 30. molecule formed from two of the same element 31. poisonous, green gas 38. he proposed that electrons have enough energy to be in constant motion 39. compound that changes from a gas to a solid at -80 degrees Celsius 40. element needed for proper muscle contractions and sends nerve impulses, found in canned meat and bacon 42. maintains normal nerve and mule functions, found in legumes and spinach 43. trial of metals that included cpperk gold, and silver 45. element that helps our body form RBC, keeps blood vessels, nerves, and immune system healthy 46. compound that does contain carbon 48. substance that has all the water removed 50. reaction in which energy is absorbed 52. anything that has mass and takes up space 53. scientist that thought atoms were the smallest particles of matter 54. atoms of an element that are chemically alike but with different masses 55. substances that take up enough water from air to dissolve completely and form a solution 56. combination of two or more substances in which the identity of each substance is not changed 57. scientist that discovered the law of definite proportions

Down 2. addition of a small amount of another element to a crystal of a semiconductor 4. scientist that did not believe that atoms could be made of empty space 5. dihydrogen monoxide 6. element that makes antioxidant enzymes, prevents cell damage 8. element needed in formation of bones, found in soy products and sweet potatoes 10. a comibnation of different metals 11. explanation based on many observations and supported by several results 15. element that is a nonmetal, reacts at high temperatures, releases CO2 when burned 16. testable prediction to explain observations 17. metals in groups 3-12 19. modern periodic table lists the elements according to this property 22. element that increases bone and tooth enamal, reduces cavities, found in aspargus and avocadoes 23. particle accelerators are used to produce these types of elements 25. each new substance formed 29. tendency to recur at regular intervals 32. compound breaks down into two or more simpler substances 33. components of a heterogenous mixture 34. substance that is being dissolved in a solution 35. scientist that used the gold foil experiment to discover the nucleus 36. can change to a gas easily at room temperature 37. simplest ratio of ions in an ionic compound 41. group 18 elements 44. comopund that does not contain carbon 47. element that produces healthy RBC, found in dark chocolate and spinach 49. specific ratio of water to ionic compound 51. group of people that proposed matter was made of 4 elements, earth , air, fire, water,