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1030 - While you wait P le a s e c o m p le te th e fo llo...

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While you wait, Ple as e  c o m ple te  the  fo llo wing  table . What frac tio n o f an ato m  is  in a unit c e ll if it is ... s c bc c fc c ato m s /c e ll C N In the  m iddle ? O n the  c o rne r? O n a fac e ? O n an e dg e ? 1 2 4 6 8 12 1 1 / 8 1 / 2 1 / 4 Density = mass/volume = (4 x 6.6e-23 g)/(5.6e-8 cm) 3 Density = 1.5 g/mL
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Section 8.7 Types of Solids Metallic Ionic Covalent Molecular Particles at  Forces holding Lattice Sites them together metal atoms ions non-metal atoms molecules metallic bonds  (type of covalent bond) ionic bonds covalent bonds inter molecular forces
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Section 7.4 Melting Point (MP) For now, the  highest  temperature at which the  substance can exist as a  solid  at  1 atm . temperature    thermal energy    movement    break the forces holding solid together mp   stronger the forces holding solid together mp   weaker the forces holding solid together We will use observations about the  melting point  to  predict the  forces holding the solid together .
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Metallic Solids Section 8.6 Metal atoms held together by metallic bonds. Metals all pool their valence electrons together into an  “electron sea”. + + + + + + + + + + + + + + + + + e e e e e e e e e e e e e e e e Delocalized  valence electrons hold  cationic metallic atoms together
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Conduction in Metallic Solids Section 8.6 + + + + + + + + + + + + + + + + + e e e e e e e e e e e e e e e e Ever-Ready + Net movement of electrons CONDUCTION !
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Section 8.6 Molecular Orbital (MO) Theory “bonding” e s are in bonds “antibonding” e s are in lone pairs 1s 1s Atomic Orbitals (1s) 1 σ Molecular Orbitals (1 σ ) 1 σ  bond! Agrees with Lewis Structure: H-H #Atomic orbitals in =  #Molecular orbitals out
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Section 8.6 Molecular Orbital (MO) Theory Atomic Orbitals Molecular Orbitals 1 σ 1s 1s 1s 1s 1 σ 1 σ Extend to more  atomic orbitals mixing #Atomic orbitals in = #Molecular orbitals out
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Section 8.6 Molecular Orbital (MO) Theory- Conductors Extend to   atomic orbitals mixing   energy BAND bonding band valence ” band Filled!
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