Chapter 9 and 10 - Chemical bond Chemical bond Interaction...

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Chemical bond Chemical bond: Interaction between two atoms. Lewis theory: 1. Valence (outer most) electrons participate in bonding. 2. Electrons can be transferred. 3. Electrons can be shared. 4. Transfer or sharing electrons occurs in such a way that each atom acquires a stable electronic configuration. This is usually the noble gas configuration or OCTET (except hydrogen, which tries to acquire 2 electrons in the outer most shell). Lewis symbols: Symbol of the element and valence electrons. Problem: Write the Lewis symbols for P and N?
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Ionic bonds Positive and negative ions form an ionic bond by electrostatic force of attraction. KBr NaCl AlCl 3
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Covalent bonds Some atoms prefer to share electrons with other atoms to form covalent compounds. Cl The shared pair of electrons (bond pair) belong to both the atoms. Lone pair of electrons are also present. Cl Cl Cl
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Coordinate covalent bonds Both the shared electrons are provided by the same atom. Example formation of hydronium ion (H 3 O + ). H + (from acid) exists as hydronium ion in water. The lone pair of electrons on oxygen are shared with hydrogen.
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Chemical bonds might have features of both types of bonds (ionic and covalent) Electrons in a bond are not shared equally in a polar covalent bond . Electrons are pulled towards the more non-metallic element. http://cwx.prenhall.com/petrucci/medialib/media_portfolio/10.html
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Electronegativity The ability of the atom to compete for electrons with other atoms to which it is bonded. decreases Increases Lower the EN more the metallic character of the element. Higher the EN more the non-metallic character of the element.
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Polar character in a covalent bond Electronegativity difference of the two atoms: Very small value covalent Large value ionic Intermediate value polar covalent Decide on the basis of metallic and non-metallic character. General rules: metal and non-metal Ionic non-metal and non-metal covalent
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Ionic bonds Covalent bonds http://cost.georgiasouthern.edu/chemistry/general/molecule/polar.htm Polar covalent bond Types of bonds-Summary
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Skeletal structures 1. Central atom. 2. Terminal atom.
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This note was uploaded on 04/01/2011 for the course CHEMISTRY 1212 taught by Professor Staff during the Spring '11 term at Georgia State.

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Chapter 9 and 10 - Chemical bond Chemical bond Interaction...

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