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9 Molecular Geometry Solutions to Exercises 9.27 Analyze/Plan. Follow the logic in Sample Exercise 9.1. Solve. bent (b), linear octahedral (oh), seesaw (ss), square pyramidal (sp), square planar (spl), tetrahedral (td), trigonal bipyramidal (tbp), trigonal planar (tr), trigonal pyramidal (tp), T-shaped (T) Electron- Molecule Valence domain Molecular or ion electrons Lewis structure geometry geometry (a) HCN 10 :N=C-H N=C-H 1 1 2- * 2- (b) 26 S td tp F F (c) SF₄ 34 S tbp SS F :F: F F F (d) 48 F F oh oh :F: F F + + : (e) 14 H-N-H N td td H H H H * (f) 16 N=N: N-N=N 1 1 *More than one resonance structure is possible. All equivalent resonance structures predict the same molecular geometry. 9.28 bent (b), linear (1), octahedral (oh), seesaw (ss) square pyramidal (sp), square planar (spl), tetrahedral (td), trigonal bipyramidal (tbp), trigonal planar (tr), trigonal pyramidal (tp), T-shaped (T) Electron- Molecule Valence Lewis domain Molecular or ion electrons structure Geometry geometry : F-As-F: (a) AsF₃ 26 As td tp : F: F F F H + H-C-H + (b) CH₃⁺ 6 C tr tr H H H : F F (c) BrF₃ 28 Br Br F tbp T F: . :F: F 237