1. MOLECULAR SHAPES

2. What is the shape of this gerber daisy? Looks two-dimensional but in reality it is three-dimensional.

3. Electron Dot Structure (Lewis Structure) Structural Formula Molecular Shape What is the shape of a molecule of methane? Methane is also three-dimensional. A Molecule of Methane

4. Molecules have three-dimensional shapes. There are many different molecular shapes possible. How can we determine what shape a particular molecule will have?

5. VSEPR Theory (Valence-Shell Electron-Pair Repulsion) VSEPR theory states that repulsion between the pairs of valence-electrons surrounding an atom causes these electron pairs to be oriented as far apart as possible. HH

6. Linear Cl H Diatomic molecules are always linear.

7. Linear BeF 2 No unshared pairs

8. The bond angle in linear molecules is 180°.

9. Trigonal-planar BF 3 No unshared pairs

10. The bond angle in trigonal planar molecules is 120°.

11. Tetrahedral CH 4 No unshared pairs

12. The bond angle in tetrahedral molecules is 109.5°.

13. A pair of unshared electrons What things are around nitrogen? Bonding electrons

14. O N F.. BENT Electrons repel each other.

15. BENT One unshared pair

16. Water O H H.. BENT Two unshared pair

17. BENT Water The bond angle in water is 104.4°.

18. NH 3 TRIGONAL-PYRAMIDAL

19. One unshared pair TRIGONAL-PYRAMIDAL