key concept2.1Atomic Structure Explains the Properties of Matter
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An element consists of only one kind of atom
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Each element has a unique number of protons
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The number of neutrons differs among isotopes
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The behavior of electrons determines chemical bonding and geometry
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key concept2.2Atoms Bond to Form Molecules
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Covalent bonds consist of shared pairs of electrons
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Ionic attractions form by electrical attraction
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Hydrogen bonds may form within or between molecules with polar covalent bonds
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Hydrophobic interactions bring together nonpolar molecules
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van der Waals forces involve contacts between atoms
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key concept2.3Atoms Change Partners in Chemical Reactions
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key concept2.4Water Is Critical for Life
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Water has a unique structure and special properties
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The reactions of life take place in aqueous solutions
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Aqueous solutions may be acidic or basic
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Apply What Youâve Learned
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