CHM1045C

Trigonal Planar Family (3 Total Electron Domains)

• 3:0 - Trigonal Planar (120°) - Example: BF₃

• 2:1 - Bent (≈120°) - Example: SO₂

• Remember: "Three total domains, going from flat to bent!"

Tetrahedral Family (4 Total Electron Domains)

• 4:0 - Tetrahedral (109.5°) - Example: CH₄

• 3:1 - Trigonal Pyramidal (≈109.5°) - Example: NH₃

• 2:2 - Bent (≈109.5°) - Example: H₂O

• Remember: "Four domains, from perfect tetrahedron to bent water!"

Trigonal Bipyramidal Family (5 Total Electron Domains)

• 5:0 - Trigonal Bipyramidal (90°, 120°) - Example: PF₅

• 4:1 - Seesaw (≈90°, ≈120°) - Example: SF₄

• 3:2 - T-shaped (≈90°) - Example: BrF₃

• 2:3 - Linear (180°) - Example: XeF₂

• Remember: "Five domains, equatorial preference for lone pairs!"

Octahedral Family (6 Total Electron Domains)

• 6:0 - Octahedral (90°) - Example: SF₆

• 5:1 - Square Pyramidal (90°) - Example: IF₅

• 4:2 - Square Planar (90°) - Example: XeF₄

• Remember: "Six domains, all 90° angles!"