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VSEPR Theory
- 2. VSEPR Valance Shell Electron Pair Repulsion Theory S Intro Postulat e Geometr y Example s Recap End
- 3. VSEPR Valance Shell Electron Pair Repulsion Theory Submitted By Dibyendu Mohanta Roll No: 158-SEM-2054-020 Intro Postulat e Geometr y Example s Recap End
- 4. VSEPR Valance Shell Electron Pair Repulsion Theory Submitted By Dibyendu Mohanta Roll No: 158-SEM-2054-020 Intro Postulat e Geometr y Example s Recap End
- 7. about Postulat e Geometr y Example s Recap End OPTION 01 The Shape of a molecule depends upon the no. of valance shell electrons around the central atom. Valance shell ep tends to occupy such positions in space that minimizes repulsion between them. OPTION 02 OPTION 03 Geometry is same but structure will be different due to lone pair & bond pair. A multiple bond is treated as a single electron pair OPTION 04 VSEPR Postulates :
- 9. about O H H O C O O H H 6 Valance Electrons 4 Valance Electrons O C O 0 Lone Pairs 2 Bond Pairs 2 Lone Pairs 2 Bond Pairs OPTION 01 The Shape of a molecule depends upon the no. of valance shell electrons around the central atom.
- 10. about O C O 116.3 pm Valance shell ep tends to occupy such positions in space that minimizes repulsion between them. OPTION 02
- 11. about The Repulsive Interaction Of Electron Pairs Decreases In The Order : lp-lp > lp-bp > bp-bp O H H Lone Pairs More Space To Move Around Bond Pairs Less Space To Move Around OPTION 03 Geometry is same but structure will be different due to lone pair & bond pair.
- 12. about All Bonds Are Treated As Single Bonds 1 Single Bond = 1 Electron Pair 1 Double Bond = 1 Electron Super Pair 1 Triple Bond = 1 Electron Super Pair O C O 2 Bond Pair C N H C N 2 Bond Pair A multiple bond is treated as a single electron pair OPTION 04
- 13. about Postulat e Geometr y Example s Recap End Determine the Molecular Geometry, looking at other atomic nuclei STEP FIVE Draw the Lewis Dot Structure of the Molecule STEP TWO Count The Lone pairs & Bond Pairs around Central Atom STEP THREE Identify The Central Atom STEP ONE Steps to identify geometry of a molecule STEP FOUR Name the Electron – Group Geometry
- 17. about Postulat e Geometr y Example s Recap End Be Cl Cl 180° Be Cl Cl LINEAR Geometry Other Examples: O C O H C N
- 18. about Postulat e Geometr y Example s Recap End B F 120° 120° 120° F 120° Lets look at a Structure when there is 3 Bond Pairs Around a Central Atom
- 19. about Postulat e Geometr y Example s Recap End B F 120° 120° 120° Trigonal Planer Geometry Other Examples : HCHO Lets look at a Structure when there is 3 Bond Pairs Around a Central Atom
- 20. about Postulat e Geometr y Example s Recap End Lets look at a Structure when there is 2 Bond Pairs & 1 Pairs Around a Central Atom S O O
- 21. about Postulat e Geometr y Example s Recap End Lets look at a Structure when there is 2 Bond Pairs & 1 Pairs Around a Central Atom Trigonal Planer Geometry Although Same Geometry like BF3 But The Shape Of the Molecule is - Bent Shape S O O
- 22. about Postulat e Geometr y Example s Recap End Lets look at a Structure when there is 4 Bond Pairs Around a Central Atom C H H H H Methane (CH4)
- 23. about Postulat e Geometr y Example s Recap End Lets look at a Structure when there is 4 Bond Pairs Around a Central Atom Tetrahedral Methane (CH4)
- 24. about Postulat e Geometr y Example s Recap End Similar to the Tetrahedral Geometry of CH4 , Ammonia (NH3) & Water (H2O) have same Geometry but different Bent like shape Tetrahedral Geometry Water (H2O) Ammonia (NH3)
- 25. about Postulat e Geometr y Example s Recap End Tetrahedral Geometry Water (H2O) Ammonia (NH3) Bent -
- 26. about Postulat e Geometr y Example s Recap End Postulates Of VSEPR Theory Learned About Lone Pair & Bond Pair Electrons Steps to find Geometry of a Molecule Geometry Of Linear Molecules Geometry Of Trigonal Planer Molecules Geometry Of Tetrahedral Molecules
- 27. about Postulat e Geometr y Example s Recap End So, Where do we go from here ? We have to practice VSEPR problems. Try to identify Common Mistakes. Then we will learn about Trigonal Bi- pyramidal & Octahedral Family.