c161l26_11_07 - Chapter 9 Chemical Bonds What are bonds?...

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Chapter 9 Chapter 9 Chemical Bonds
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What are bonds? What are bonds? W Because the nuclei cannot change, the formation of bonds has to involve the electrons W Because the inner core electrons are held so tightly, it must be the valence electrons
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Molecular compounds Molecular compounds W Do not form ionic bonds W Electrons simultaneously occupy orbitals from each atom share electrons must be paired (just like atomic orbitals)
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What happens when a bond forms What happens when a bond forms
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Representing valence Representing valence electrons electrons W Lewis symbols are a convenient representation of atoms and their valence electrons W Symbol surrounded by one dot for each valence electron Location doesn’t matter Put paired electrons together
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Examples Examples H He : Li Be : B : C : N : :O : :F :
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Ionic Bonds Ionic Bonds W Ionic compounds are formed from the transfer of electrons W The coulombic attraction of cation and anion for each other are what hold in
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c161l26_11_07 - Chapter 9 Chemical Bonds What are bonds?...

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