determining bond angle and geometry from hybridization

The number of hybrid orbitals on an atom determines its hybridization. sp3 hybridized atoms all have bond angles of 109.5 degrees down to about 104.5 degrees, depending on how many lone pairs are on the atom. sp2 hybridized atoms all have bond angles close to 120 degrees. sp hybridized atoms have bond angles of 180 degrees. Atomic geometry depends solely on the orientation of the attached atoms, not the lone pairs. Possible geometries include linear, trigonal planar, bent, tetrahedral, and trigonal pyramidal.