Chapter2_Lecture2

Chapter2_Lecture2 - EMCH371ENGINEERING MATERIALS...

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EMCH 371 ENGINEERING  MATERIALS Ch. 2 Atomic Bonding
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2 Atomic Bonding Issues to address… Why study atomic structure and interatomic bonding? What promotes bonding? What types of bonds are there? What is ionic bonding?
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Atomic Structure Figure 2-1, Shackelford Schematic of the planetary model of a C 12 atom hydrogen atom Atomic number: Z
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4 Quantum Mechanics Theory Electron configuration : the distribution of electrons within the permissible energy levels The subshells can be arranged in order of increasing energy as: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d,…. . The max. # of electrons in an s, p, d, and f subshell are 2, 6, 10, and 14 In the ground state , an atom’s electrons occupy the lowest-energy subshells consistent with the Pauli exclusion principle. Full filled subshell tends to be the most stable state: s 2 , p 6 , d 10 , f 14 Half filled subshell tends to be a stable state: s 1 , p 3 , d 5 , f 7 Carbon electron configuration: 6 electrons: 1s 2 2s 2 p 2 vs 1s 2 2s 1 2p 3 hybridization
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Chapter2_Lecture2 - EMCH371ENGINEERING MATERIALS...

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