MATS 3011 Lecture Notes - Lecture 13: Covalent Bond

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15 Jul 2014
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Example: 13al: 1s22s22p63s23p1; wants to give up 3 electrons b/c 3 on energy level 3. Medium to strong ex: al: tmp = 660 oc. Bonding strength increases as you move down tablealso b/c w has more electrons to give up -->more charge difference. Special case of secondary bonding that occurs in molecules w/ h. Strength of h bonding: roughly 5% of that of covalent bonding van der waal bond. One ar"s electrons see + nucleus of other -->attracted -->very slight. H bonding is responsible in dna, in polymer-like polyethene. Random atom arrangement -->amorphous material, no long range order (composition isn"t very same throughout) Lattice = 3d array of points, where each pt. has surrounding identical to that of all other points (the surroundings you see) Basis = atom or group of atoms associated w/ each lattice point (the person sitting and observing the surroundings)

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