Handout 1 - Lewis Structures: pictorial representation of...

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Lewis Structures: pictorial representation of molecule: represent e - as dots 1.3-1.4, 1.7 1) Predict connectivity 2) Count valence electrons for molecule negative charge: + 1 positive charge: - 1 3) Add electrons for bonds 4) Calculate number of unused electrons. 5) Add remaining electrons to fill valences (but not more). Most electronegative atoms first. 2 for H, Li, Na 8 for C, N, O, F B 8 or 6 6) Add multiple bonds to fill valences (but not more). 7) Check formal charges . Formal Charge = (valence electrons for atom) – 1/2 (bonding electrons) – (non-bonding electrons) Atoms + LP Arrangement of Electron Pairs Hybridization 1.9-1.10, 2.6, 4 tetrahedral sp 3 2.20-2.22 3 trigonal sp 2 2 linear sp 1 ----- s Bond-line formula 1.6 1) Letter C, for carbon, not shown: intersection or end 2) H bound to C not shown ( 4 bonds to C!! (unless charged)) 3) H bound to other atoms (O, N, …) shown 4) All atoms other than C and H shown Resonance 1.8 1) Individual resonance forms do not represent the real molecule:
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Handout 1 - Lewis Structures: pictorial representation of...

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