Abstract: An atomic model in a single piece of injection-molded plastic is provided herein which represents the two electrons in co-valent electron bonding between atoms, and simultaneously represents the allosteric spin capability around an axis perpendicular to the centers of two conjoint co-valent electron faces on two atoms. This model includes a small cylindrical stud arising from a flat face cut into one (or up to four) curved surfaces or segment(s) of a physical three-dimensional spherical body which represents the electron available for donation by an atom. It also includes on each face a hole which is cut intaglio or dropped vertically into the face of the atom next to the raised stud. This hole is arced in a 90-degree arc about the contiguous electron-representing stud which arises above it like a nose above a smiling mouth. This arced slot represents the available space in the outer shell of the receiving atom into which a donated electron-stud from another atom may be inserted.