Molecular Geometry Flashcards
steric # = 2
0 lone pairs
linear
180
steric # = 3
0 lone pairs
trigonal planar
120
steric # = 3
1 lone pair
bent (trigonal planar)
less than 120
steric # = 4
0 lone pairs
tetrahedral
109.5
steric # = 4
1 lone pair
trigonal pyramidal
less than 109.5
steric # = 4
2 lone pairs
bent (angular; tetrahedral)
less than 109.5
steric # = 5
0 lone pairs
trigonal bipyramidal
90 or 120
steric # = 5
1 lone pair
seesaw
less than 90 or less than 120
steric # = 5
2 lone pairs
T-shaped
less than 90
steric # = 5
3 lone pairs
linear
180
steric # = 6
0 lone pairs
octahedral
90
steric # = 6
1 lone pairs
square pyramidal
less than 90
steric # = 6
2 lone pairs
square planar
90
how to find steric number
SN = (# bound to central atom) + (# of lone pairs on central atom)
e- pair number vs molecular geometry
e- pair number represents the standard geometry of steric #
molecular geometry incorporates lone pair when needed
