Nba 2 nlp 0 sn 2 the two electron pairs about the be

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NBA = 2 NLP = 0 SN = 2 The two electron pairs about the Be repel each other and try to get as far apart as possible. This results in: EPG = Linear
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Slide 7 VSEPR: SN = 2 Be F F The Electron Pair Geometry ( EPG ) and Molecular Geometry ( MG ) are determined by only the electron pairs (both bonding and non-bonding) around the central (Be) atom. NBA = 2 NLP = 0 SN = 2 Because there are no Lone Pairs (non-bonding pairs of electrons, MG = EPG = Linear 180 o Text: AX 2 E 0 EPG = Linear F Be F
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Slide 8 VSEPR: SN = 3 NBA = 3 NLP = 0 SN = 3 The 3 electron pairs about the Boron repel each other and try to get as far apart as possible. This results in: B F F F EPG = Trigonal Planar
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Slide 9 VSEPR: SN = 3 NBA = 3 NLP = 0 SN = 3 Because there are no lone pairs, MG = EPG = Trigonal Planar 120 o EPG = Trigonal Planar Text: AX 3 E 0 B F F F B F F F
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Slide 10 SN = 3: Ozone (O 3 ) The 3 electron “pairs” about the oxygen repel each other and try to get as far apart as possible. This results in a planar triangular arrangement. EPG = Trigonal Planar MG = Bent 120 o O O O O O O One of two resonance structures NBA = 2 NLP = 1 SN = 3 120 o Text: Also called V-shaped Text: AX 2 E 1 O O O O O O
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Slide 11 Summary The Two Molecular Geometries for a Trigonal Planar EPG (i.e. SN = 3) Examples: SO 3 , BF 3 , NO 3 - , CO 3 2- Examples: SO 2 , O 3 , PbCl 2 , SnBr 2 NBA = 3 Trigonal Planar MG NBA = 2 Bent MG
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Slide 12 VSEPR: SN = 4 NBA = 4 NLP = 0 SN = 4 The 4 electron pairs about the Carbon repel each other and try to get as far apart as possible. This results in: C H H H H EPG = Tetrahedral
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Slide 13 NBA = 4 NLP = 0 SN = 4 EPG = Tetrahedral Because there are no lone pair electrons MG = EPG = Tetrahedral 109.5 o Text: AX 4 E 0 C H H H H C H H H H
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Slide 14 N H H H O H H C H H H H The trend in bond angles results from the fact that electron lone-pairs take up more space than electron bonded pairs .
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