Useful Information VSEPR etc.

Useful Information VSEPR etc. - Lewis Structure Resonances:...

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Lewis Structure Resonances: Two or more arrangements of valence electrons with nuclei and core electrons in fixed positions (e.g., aromatics!) Remember: Resonance corresponds to one electron distribution (molecular orbital), not electrons switching between different structures. Note: Usually you will encounter resonance hybrids that correspond to different arrangements of valence electrons that are equivalent (e.g., ozone, carbonate, acetate, benzene). Some resonance hybrids involve structures that are not of equivalent weight as evidenced by different formal charges (e.g., peptide or amide bond).
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Exceptions to octet rule: 1. Electron deficient compounds (Be, B mainly) 2. Molecules with odd number of electrons: Free Radicals; reactive! (NO, NO 2 ,…) 3. Expansion of octet: What you NEED TO KNOW (for exam): XY n : X is 3 rd Period (5, 6, 7, 8) Y has large Electronegativity (F, Cl, O,…) Be able to predict structures of molecules with expanded octets (VSEPR, Valence Bond) What you DON’T NEED TO KNOW but I would like you to know:
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Useful Information VSEPR etc. - Lewis Structure Resonances:...

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