vsepr theory
DESCRIPTION
VSEPR Theory. Valence Shell Electron Pair Repulsion. VSEPR Theory. Predicts the molecular shape of a bonded molecule Electrons around the central atom arrange themselves as far apart from each other as possible Unshared pairs of electrons (lone pairs) on the central atom repel the most - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: VSEPR Theory](https://reader036.vdocuments.mx/reader036/viewer/2022062808/568153e3550346895dc1e1ee/html5/thumbnails/1.jpg)
VSEPR Theory
Valence Shell Electron Pair Repulsion
![Page 2: VSEPR Theory](https://reader036.vdocuments.mx/reader036/viewer/2022062808/568153e3550346895dc1e1ee/html5/thumbnails/2.jpg)
VSEPR Theory
• Predicts the molecular shape of a bonded molecule
• Electrons around the central atom arrange themselves as far apart from each other as possible
• Unshared pairs of electrons (lone pairs) on the central atom repel the most
• So only look at what is connected to the central atom
![Page 3: VSEPR Theory](https://reader036.vdocuments.mx/reader036/viewer/2022062808/568153e3550346895dc1e1ee/html5/thumbnails/3.jpg)
These are for molecules with only paired
electrons around the central atom.
![Page 4: VSEPR Theory](https://reader036.vdocuments.mx/reader036/viewer/2022062808/568153e3550346895dc1e1ee/html5/thumbnails/4.jpg)
Linear
• 2 atoms attached to center atom
• 0 unshared pairs (lone pairs)
• Bond angle = 180o
• Type: AX2
• Ex. : BeF2
![Page 5: VSEPR Theory](https://reader036.vdocuments.mx/reader036/viewer/2022062808/568153e3550346895dc1e1ee/html5/thumbnails/5.jpg)
Trigonal Planar
• 3 atoms attached to center atom
• 0 lone pairs
• Bond angle = 120o
• Type: AX3
• Ex. : AlF3
![Page 6: VSEPR Theory](https://reader036.vdocuments.mx/reader036/viewer/2022062808/568153e3550346895dc1e1ee/html5/thumbnails/6.jpg)
Tetrahedral
• 4 atoms attached to center atom
• 0 lone pairs
• Bond angle = 109.5o
• Type: AX4
• Ex. : CH4
![Page 7: VSEPR Theory](https://reader036.vdocuments.mx/reader036/viewer/2022062808/568153e3550346895dc1e1ee/html5/thumbnails/7.jpg)
Trigonal Bipyramidal
• 5 atoms attached to center atom• 0 lone pairs
• Bond angle = – equatorial -> 120o
– axial -> 90o
• Type: AX5
• Ex. : PF5
![Page 8: VSEPR Theory](https://reader036.vdocuments.mx/reader036/viewer/2022062808/568153e3550346895dc1e1ee/html5/thumbnails/8.jpg)
Octahedral
• 6 atoms attached to center atom
• 0 lone pairs
• Bond angle = 90o
• Type: AX6
• Ex. : SF6
![Page 9: VSEPR Theory](https://reader036.vdocuments.mx/reader036/viewer/2022062808/568153e3550346895dc1e1ee/html5/thumbnails/9.jpg)
These are for molecules with both paired and
unshared (lone) pairs of electrons around the
central atom.
![Page 10: VSEPR Theory](https://reader036.vdocuments.mx/reader036/viewer/2022062808/568153e3550346895dc1e1ee/html5/thumbnails/10.jpg)
Bent
• 2 atoms attached to center atom
• 2 lone pairs
• Bond angle = 104.5o
• Type: AX2E2
• Ex. : H2O
![Page 11: VSEPR Theory](https://reader036.vdocuments.mx/reader036/viewer/2022062808/568153e3550346895dc1e1ee/html5/thumbnails/11.jpg)
Trigonal Pyramidal
• 3 atoms attached to center atom
• 1 lone pair
• Bond angle = 107o
• Type: AX3E
• Ex. : NH3
![Page 12: VSEPR Theory](https://reader036.vdocuments.mx/reader036/viewer/2022062808/568153e3550346895dc1e1ee/html5/thumbnails/12.jpg)