Chapter2 - Chapter 2 Atomic Scale Structures Introduction...

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• Introduction Atomic Structure Thermodynamics and Kinetics Primary Bonds Bond-Energy Curve Atomic Packing and Coordination Secondary Bonds Mixed Bonds Structure of Polymer Materials Chapter 2 Atomic Scale Structures
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Introductory Remarks for Chapter 2- Atomic Scale Structures Why do certain materials have particular sets of properties? – Why are metals good electrical conductors while plastics and ceramics are good insulators? – Why are some materials stiff, and what controls the stiffness? – Why do some materials expand with temperature while others do not?
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Introductory Remarks for Chapter 2- Atomic Scale Structures Although properties depend on all levels of structure, many are determined by the atomic scale. – The types of atoms present. – The types of bonds in the material. – The way the atoms are packed. In Chapter 2 we review – Structure of the atom – Basic concepts from thermodynamics and kinetics – Types of bonds
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Electrons 1s 2 2s 2 3s 2 4s 2 2p 6 3p 6 3d 10 Zn- Atomic number 30 Bohr Model for a Zinc Atom Nucleus Number of electrons = 2(2l + 1), where l = 0, s (2) l = 1, p (6) l = 2, d (10) l = 3, f (14)
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