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Chapter 2

CHAPTER 2.docx

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Biological Sciences
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Wednesday May 18, 2011 CHAPTER 2 1  Atoms are composed of protons, neutrons, and electrons  Number of protons determines element  Isotopes contain different number of neutrons  Electrons form bonds between atoms and capture energy o Covalent bonds o Ions  Anion-negatively charged ion  Cation-positively charged ion o High-energ
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