Chapter 2.6

Chapter 2.6 - Covalent Bonding (I) In covalent bonding,...

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21 MSE 2090: Introduction to Materials Science Chapter 2, Bonding Covalent Bonding (I) In covalent bonding, electrons are shared between the molecules, to saturate the valency. In this case the electrons are not transferred as in the ionic bonding, but they are localized between the neighboring ions and form directional bond between them. The ions repel each other, but are attracted to the electrons that spend most of the time in between the ions. Formation of covalent bonds: • Cooperative sharing of valence electrons • Can be described by orbital overlap • Covalent bonds are HIGHLY directional • Bonds - in the direction of the greatest orbital overlap • Covalent bond model: an atom can covalently bond with at most 8-N’, N’ = number of valence electrons Example: Cl 2 molecule. Z Cl =17 (1S 2 2S 2 2P 6 3S 2 3P 5 ) N’ = 7, 8 - N’ = 1 can form only one covalent bond
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22 MSE 2090: Introduction to Materials Science Chapter 2, Bonding Covalent Bonding (II) Example: Carbon materials. Z
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This note was uploaded on 02/14/2012 for the course MSE 2090 taught by Professor Leoindzhiglei during the Fall '10 term at UVA.

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Chapter 2.6 - Covalent Bonding (I) In covalent bonding,...

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