Ch 3 - Ch 3 Preface When two atoms come close together, the...

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Ch 3 Preface When two atoms come close together, the electrons of each atom experience the additional attractive force of the other nucleus. o The electrons repel each other and the positively charged nuclei experience a mutually repulsive force Stable chemical bond between atoms in the gas phase is formed when the resulting energy of the molecule is lower than that of the two isolated atoms. QUANTUM MECHANICS - a branch of physics that descries properties of atoms and subatomic particles. COVALENT BOND - electrons are shared between two atoms comprising the bond IONIC BOND - electrons are lost/gained, strength in bond comes from the electrostatic interaction between ions POLAR COVALENT BOND - transfer of charge from one atom to another ELECTRONEGATIVITY - the tendency of an atom in a molecule to draw atoms towards itself o Explains what bonds are ionic, covalent or polar covalent Tools used to implement Classical Theory o LEWIS ELECTRON DOT DIAGRAM - schematic showing VALENCE electrons and whether they're bonding or not bonding, they also show predicting connectivity o VSEPR THEORY - method to predict molecular shapes Based on electrostatic argument that electron pairs in a molecule will
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This note was uploaded on 10/09/2011 for the course CHEM 20A taught by Professor Scerri during the Spring '05 term at UCLA.

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Ch 3 - Ch 3 Preface When two atoms come close together, the...

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