CHE 8A Lecture Notes - Lecture 2: Atomic Orbital, Structural Formula, Potassium Bromide

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19 Jan 2018
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We don"t use them very often in o chem. Atoms have protons (p+), neutrons (n0), electrons (e-) We don"t really care about these that much. They are part of what makes the atom what it is. # of valence e- is equal to the last digit of the group # We care about where the valence e- are. Ex: li and f li+ and f- lif. Usually between a metal and a nonmetal. Sharing e-s between 2 or more nonmetals (generally) Ex: f and f f2 (to fill the octet) Curved arrows in o chem represent e- movement. The spectrum between completely even sharing of e- and complete transfer of e-s. A polar arrow (also called a dipole moment) Plus end on the pos. side + We describe the amount of transfer using electronegativity (en) En: the pull an atom has on a bonded e- pair. A relationship between exactly 2 atoms and their shared e- pair.

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