Shapes of molecules

Electron repulsion theory

-The shape of the molecule is determined by the electron pairs surrounding the central atom

-Electron pairs in the outer shell repel as far apart as possible so they achieve the maximum possible separation

Repulsion : lone-pair lone-pair >Lone-pair bond pair> Bond-pair bond-pair

2 bonding pair

0 lone pair : Linear 180 degrees

1 lone pair : Bent 117.5 degrees

2 lone pair : Bent 104.5 degrees

3 lone pair : Linear 180 degrees

4 lone pair : Linear 180 degrees

3 bonding pair

0 lone pair : Trigonal planar 120 degrees

1 lone pair : Trigonal pyramidal 107.5 degrees

2 lone pair : T-shape 85 degrees

3 lone pair : T-shape 87.5 degrees

4 bonding pair

0 lone pair : Tetrahedeal 109.5 degrees

1 lone pair : Sawhorse 87.5 and 117.5 degrees

2 lone pair : Square planar 90 degrees

5 bonding pair

0 lone pair : Trigonal bipyramidal 90 and 120 degrees

1 lone pair : Square pyramidal 87.5 degrees

6 bonding pair

0 lone pair : Octahedral 90 degrees