SAMPLE PROBLEM 10.10
(continued)
(b) BF3 has 24 valence electrons and all electrons around the B will be involved in bonds. The shape is AX3 (trigonal planar).
F (EN 4.0) is more electronegative than B (EN 2.0) and all of the bond dipoles will be directed from B to F. Because all are at the same angle and of the same magnitude, the molecule is non-polar.
120o
(c) SCO is linear. C and S have the same EN (2.0), but the C=O bond is polar(DEN = 1.0), so the molecule is polar.
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