L11-Interactions_of_Atoms

L11-Interactions_of_Atoms - Part II Interactions of Atoms:...

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Part II Interactions of Atoms: Bonding and Lewis Dot Formulas Covalent Bonds: HF Fact: a gas at room temperature Would it be classifed as covalent or ionic? Would it be classifed as polar or nonpolar? Which atom is hogging the electrons? Lewis Dot Formulas a representation that keeps track of the electrons involved in covalent bonding the valence electrons the core (inner electrons are not involved in bonding) each dot represents a single electron for a bond, two dots are needed Lewis Dot Formulas used as an approximation to suggest bonding schemes illustrates the following number of valence electrons number and kinds of bonds order in which the atoms are connected 1 2 3 4
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Lewis Dot Formulas Does NOT represent the 3-D shapes of molecules and polyatomic ions Lewis Dot Formulas: the Octet Rule in most compounds, the elements of a molecule achieve a noble gas conFguration H X Lewis Dot Formulas: the Octet Rule in most compounds, the elements of a molecule achieve a noble gas conFguration speciFcs that need to be addressed: how many of the valence electrons are involved in bonding? bonding pairs how many of the valence electrons are unshared? lone pair electrons Lewis Dot Formulas: the Octet Rule S = N A S : total number of shared electrons in the molecule or polyatomic ion N : total number of valence shell electrons needed based on the octet rule A : total number of valence shell electrons available based on the group number 5 6 7 8
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L11-Interactions_of_Atoms - Part II Interactions of Atoms:...

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