151F09_W9_LV_3_short - UA GenChem General Chemistry General...

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Unformatted text preview: UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 9 UA GenChem REVIEWING CHEMICAL BONDING REVIEWING CHEMICAL BONDING In a chemical reaction between two atoms, their valence electrons are reorganized. Atoms lose or share electrons because that leads to a more stable state ( full electron shells ). During the process, a net attractive force occurs between atoms + Li + F- Ionic bond Electrostatic force UA GenChem CHEMICAL BONDING CHEMICAL BONDING + F-F Covalent bond The tendency in molecular compounds is to have a structure in which each atom has eight valence electrons (OCTET RULE) (OCTET RULE) The atoms in a molecular compound are connected by covalent bonds (sharing) The number of covalent bonds that each atom forms is determined by the number of electrons that the atom must share to achieve a noble gas configuration ( full shell ) UA GenChem Electron Distribution in Molecules Electron Distribution in Molecules • Electron distribution is Electron distribution is depicted with depicted with Lewis electron dot Lewis electron dot structures structures • Electrons are distributed as: Electrons are distributed as: shared shared = = BOND PAIRS BOND PAIRS or or unshared unshared = = LONE PAIRS. LONE PAIRS. G. N. Lewis G. N. Lewis 1875 - 1946 1875 - 1946 UA GenChem LONE LONE PAIRS PAIRS A Lewis Electron Dot A Lewis Electron Dot Structure Structure H Cl : .. .. BOND BOND PAIRS PAIRS UA GenChem Building a Lewis Structure Building a Lewis Structure 2. 2. Decide on the Decide on the central atom central atom ; ; never H never H ....
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This note was uploaded on 02/06/2012 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at University of Arizona- Tucson.

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151F09_W9_LV_3_short - UA GenChem General Chemistry General...

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