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net dipole H O: net dipol H : + a) N H b) C C / c) C H H F F H + H F H H net dipole 1.22 H a) H C C H b) H-C=C=C-H + H H H H trigonal trigonal tetrahedral planar linear trigonal planar planar trigonal planar 1.23 A doubly bonded oxygen needs 4 more electrons to satisfy the octet rule. A sulfur with one covalent bond needs six more electrons to satisfy the octet rule. This gives the S a formal charge of -1. The resonance structure has the double bond to the S and the negative formal charge on the O. The situation is very similar to acetate anion (see problem 1.10). H H O: H-C C H-C-C S S: H H 1.24 H H C C bent geometry at oxygen H H (tetrahedral electron pairs) H H 7