Stereoisomers are isomeric molecules that have the same molecular formula and sequence of bonded atoms (constitution), but which differ only in the three-dimensional orientations of their atoms in space. Columbia Encyclopedia. "Stereoisomers" in Encyclopedia.com, n.l., 2005, Link, December 7th 2005. Structural isomers share the same molecular formula, but the bond connections and/or their order between different atoms/groups differs. In stereoisomers, the order and bond connections of the consti… (More on Stereoisomer)