CH-2230 Lecture Notes - Lecture 1: Lewis Acids And Bases, Lewis Structure, Chemical Polarity
21 Jan 2018
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Its placed in the center of the periodic table. Lewis theory: an atom will give, accept or share electrons to fill the outer shell. Octet rule: atom is most stable with 8 electrons in its valence shell. Carbon does a mix of gaining and losing. Electronegativity trend = increases going to the right and upward. Bond dipoles originate from bonds b/w atoms of different electronegativity. Dipole: one end is positive and the other is negative. Big difference in en = more polar bond. What needs to be known in order to draw lewis structures: How many electrons are needed to build the structure. Central atom: the atomt hat can form the most bonds. When drawing: make sure to fill octet of each atom. Formal charge: accounts for differences in the compound. Total charge of compound: sum of formal charges. Electrons are more stable the farther they are apart. Lewis structure predict regions of electron density around the central atom.
