chem104alecture26 - 1 Chem 104A, UC, Berkeley Chem 104A,...

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Unformatted text preview: 1 Chem 104A, UC, Berkeley Chem 104A, UC, Berkeley Chem 104A, UC, Berkeley Chem 104A, UC, Berkeley 2 Chem 104A, UC, Berkeley Chem 104A, UC, Berkeley Chem 104A, UC, Berkeley Chem 104A, UC, Berkeley 3 Chem 104A, UC, Berkeley Metal Metal Chem 104A, UC, Berkeley Metallic Hydrogen Metallic Hydrogen Chem 104A, UC, Berkeley In extended solid, each atomic/molecular orbtial will develop into one band! 192 Chem 104A, UC, Berkeley Sodium According to Band Theory Sodium According to Band Theory Conduction band: empty 3 s antibonding Valence band: full 3 s bonding No gap 4 Chem 104A, UC, Berkeley Conduction Band Valence bond 194 Chem 104A, UC, Berkeley Bonding in Metals z The electron-sea model is a simple depiction of a metal as an array of positive ions surrounded by delocalized valence electrons. Metals are good conductors of electricity because of the mobility of these delocalized valence electrons. A metal also conducts heat well because the mobile electrons can carry additional kinetic energy. 195 Chem 104A, UC, Berkeley Bonding in Metals 196 Chem 104A, UC, Berkeley Bonding in Metals z Molecular orbital theory gives a more detailed picture of the bonding in metals. According to band theory, the electrons in a crystal become free to move when they are excited to the unoccupied orbitals of a band . In a metal, this requires little energy since the unoccupied orbitals lie just above the occupied orbitals of highest energy. 5 Chem 104A, UC, Berkeley Semiconductor Semiconductor 198 Chem 104A, UC, Berkeley Structure of Diamond Structure of Diamond 199 Chem 104A, UC, Berkeley Diamond Diamond z Diamond has a three-dimensional network structure in which each carbon is singly-bonded to four others with sp 3 hybridization. z Why do diamonds conduct heat? z Metals conduct heat because the the mobile electrons can carry additional kinetic energy....
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chem104alecture26 - 1 Chem 104A, UC, Berkeley Chem 104A,...

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