What is the VSEPR theory?

• The VSEPR theory or better known as the valence shell electron pair repulsion theory, is one that is  based the idea that eletron groups repel each other through coulombic forces.The repulsions between electron groups on the interior atoms  of a molecule  determines the geometry of the molecule.

What are the characteristics of Two Electron groups

• This group has two electron groups( two single bonds) about the central bonding atom.
• The geometry of this group is determined throough the repulsion between the groups which  assume 180 degree bond angles or linear geometry[image]

What are the characteristics of Three electron  group

• Has three electron groups around the central atom
• Each bond forms 120 degree angles
• [image]

What are the characteristics of the Five electron groups

• Five electron groups around the central atom
• three of the electron groups lie in a single plane  as in trigonal bipyramidal geometry and the other two bonds on either side of the trigonal plane
• Angles are not the same
• Angles between the equatorial positions(The three bonds in the trigonal plane)120 degrees
•  angles in the axial positions( the two bonds on either side of the trigonal plane) are 90 degree
• [image]

What are the Characterisitc of four electron groups

• Three dimensional
• Tetrahedral Geometry- bonding angels of 109.5 
• [image]

What are the characteristics of six electron group

• Six electron groups around a central atom, assumes an octahedral geometry
• Four group  lie in a single plane with the five and six groups above and below it. The  angles are all 90 degrees
• [image] 

What are the characteristics of four electron groups with lone pairs

• Central atom has four electron groups(One lone pair and three bonding)or sometimes(two bonding pairs and two lone pairs)
• Electrong geometry is tetrahedral
• Molecular geometry- trigonal pyramidal or( sometimes bent like H20) Ex:One lone pair and three bonding( trigonal pyramidal)
• [image]
• [image]Bent(two bonding pairs and two lone pairs)

What are the characteristics of five electron groups with lone pairs

• Central atom usually has one lone pair and four bonding or(two lone pairs and three group,or three lone pairs and two bonding
• electron geometry is Trigonal bipyramidal
• Molecular Geometry for one lone pair and four bonding(Seesaw)
• [image]

• two lone pairs and three group(T-shaped)
• [image]
• three lone pairs and two bonding(Linear )[image]

What are the characteristics of six electron groups with lone pairs

• Central atom has one lone pair and five bondings(or two lone pairs and four bonding.
• Electron geometry Octahedral
• Ex:Central atom has one lone pair and five bondings(Square pyramidal)
• [image]
• [image]ex:or two lone pairs and four bonding(Square planar)