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Chapter 12: Numbers 42, 46, 50, 52, 54, 64, 66 (pages 316-319) Chapter 13: Numbers 2, 14, 18, 30, 38, 48, 50, 54, 66, 68, 74 (pages 343-346) 42. The atoms that make up your body are mostly empty space, and structures such as the chair youre sitting on are composed of atoms that are mostly empty space. So why dont you fall through the chair? 46. If two protons and two neutrons are removed from the nucleus of an oxygen-16 atom, a nucleus of which element remains? 50. Which has more atoms a 1-g sample of carbon-12 or a 1-g sample of carbon-13? Explain 52. Which contributes more to an atoms mass: electrons or protons? Which contributes more to atoms size? 64. With the periodic table as your guide, describe the element selenium, Se? 66. With scanning probe microscopy technology, we see not actual atoms but rather images of them. Explain? Chapter 13: Numbers 2, 14, 18, 30, 38, 48, 50, 54, 66, 68, 74 (pages 343-346) 2. What is the origin of most of the natural radiation we encounter?2.... View Full Document

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