CHE 2A Lecture Notes - Lecture 3: Electronegativity, Nuclear Shell Model, Electron Configuration

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CHE 2A Full Course Notes
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First periodic table: organized by increasing atomic mass. Structure of periodic table is based on electron configuration pattern and presence of shells. Electron configuration can be deduced from element"s position in periodic table (with some exceptions) Many periodic trends and atomic properties can be explained using coulomb"s law, the shell model, nuclear charge, and concepts of shielding. Ionization energy: how much energy is needed to pull off one valence electron. Electronegativity: the ability of an atom to pull electrons towards itself in a bond. Generally increases from left to right and decreases from top to bottom.

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