lewisStr1 - TYPES OF COMPOUNDS Ionic Ions of opposite...

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TYPES OF COMPOUNDS Ionic Covalent Ions of opposite charge Bond formed by held together by sharing 2 or more coulomb (charge) force e - between atoms M + … X H H
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L-1 LEWIS STRUCTURES Lewis Electron Dot Model is useful in describing bonding in molecules in which covalent bonds exist. Ex: H + H H H We want to distribute the valence electrons so that each main group element “sees” 8 valence electrons, except hydrogen, which sees 2.
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L-2 DRAWING LEWIS STRUCTURES Usually molecular structure is known. If not, choose central atom in molecule as one requiring the largest no. of e - ‘s (in addition to those already in its valence shell) to achieve a noble gas (8) configuration. The following rules work well with representative elements. In summary: 1. A = Total no. e ’s available in outer shells of all atoms ( P.G. No.). One e must be added for each negative charge or subtracted for each positive charge of an ion.
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This note was uploaded on 06/22/2008 for the course CHEM 116 taught by Professor Burns during the Fall '06 term at Ill. Chicago.

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lewisStr1 - TYPES OF COMPOUNDS Ionic Ions of opposite...

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