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- 1. VSEPR THEORY<br />11 Important Shapes of VSEPR<br />
- 2. Linear Structures2 electron domains, 0 lone pairs<br /><ul><li>(AX2)
- 3. Angle between bonds: 180°
- 4. Example: BeF2, HCN, andCO2</li></li></ul><li>Trigonal Planar Structures3 electron domains, o lone pairs<br /><ul><li>(AX3)
- 5. Angle between </li></ul>bonds is 120°<br /><ul><li>Example: BF3, BH3</li></li></ul><li>Bent Structures3 electron domains, 2 bonding pairs, 1 lone pairs or 4 electron domains, 2 bonding pairs, 2 lone pairs<br /><ul><li># of bonding pairs-2
- 6. # of lone pairs-1
- 7. Example: NO2 </li></ul>OR<br /><ul><li># of bonding pairs-2
- 8. # of lone pairs-2
- 9. Example: H20</li></li></ul><li>Tetrahedral Structures:(4 electron domains, 0 lone pairs)<br /><ul><li>(AX4)
- 10. Angle between bonds is ~109.5°
- 11. Example: CH4</li></li></ul><li>Trigonal Pyramidal Structures(4 electron domains, 3 bonding pairs, 1 lone pair)<br /><ul><li>(AX3E)
- 12. Bond angles are <120°
- 13. Structure is non-planar </li></ul> due to repulsion of <br /> lone-pair<br /><ul><li>Example: NH3—bond angles are </li></ul>107°<br />
- 14. TrigonalBypyramidal5 electron domains, 0 lone pairs<br /><ul><li>(AX5)
- 15. 120° in plane, and 90° above and below
- 16. Example: PCl5 , PF5
- 17. Repulsion between 5 pairs of valence electrons on the phosphorous atom in PF5 can be minimized</li></ul> by distributing these electrons towards <br /> the corners.<br />
- 18. Seesaw5 electron domains, 4 bonding pairs, 1 lone pair<br /><ul><li>(AX4E)
- 19. Example: SF4
- 20. 5 regions of electron density
- 21. In the see saw structure the lone pair is found in the equatorial plane because the lone pair likes to spread out as much as possible.</li></li></ul><li>T-Shaped5 electron domains, 3 bonding pairs, 2 lone pairs<br /><ul><li>(AX3E2)
- 22. Example: ClF3
- 23. Lone pairs are again found in the equatorial place because the lone pairs want to spread out as much as possible!</li></li></ul><li>Linear5 Electron Domains, 2 bonding pairs, 3 lone pairs<br /><ul><li>(AX2E3)
- 24. Example: XeF2, I3 </li></li></ul><li>Octahedral6 electron domains, 0 lone pairs<br /><ul><li>(AX6)
- 25. Example: SF6
- 26. All angles are 90° </li></li></ul><li>Square Pyramidal6 electron domains, 5 bonding pairs, 1 lone pair<br /><ul><li>(AX5E)
- 27. Example: BrF5</li></li></ul><li>Square Planar6 Electron Domains, 4 bonding pairs, 2 lone pair<br /><ul><li>(AX4E2)
- 28. Example: XeF4</li>

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