Unit - Big 45mm Atoms & Even Longer Bonds

Teaching Big Concepts?
Use Big Models!

Unit Molecular Models

Get the biggest molecular models-Unit atoms are 45mm in diameter. Compare the Unit cyclohexane to the smaller one.

Build big models-giant ice to VSEPR Theory or unique close packed crystal structures.

Prefer lots of smaller atoms? See our Orbit crystal lattice structure models.

And, we have all the spares to custom models, expand existing structures or replace missing bits

Big Molecular Models for Big Classrooms

Unit style molecular models are so versatile they're practically in their own multiverse. Use them for organic/inorganic, VSEPR, Point Groups or lattice structures. Unit atoms are 45mm diameter & make any compound or crystal structure visible at the back of large lecture halls.

Unit atoms were designed for crystal lattices and are configurable for 1-6, 8 & 12 coordinate geometries.

More Information

The Unit system is unique in that any atom can take on any geometry. Below are just a few of the ways the atoms & pegs can be combined.

*  Images containing white pegs are older style which you may stil possess. 12 coord. pegs are unique.

Bond Pegs & Atom Geometries Examples of Where Used
Unit Pegs Angled Pegs (left): Use 4 for tetrahedral geometry; Use 8 for 8 coordinate

Radial Pegs (Middle): Used for 30, 45, 60, 90, 120 or 180 degrees

Polar Pegs (Right): One at each pole for linear atoms; Use with 3 Radial pegs for Tri-Bi
Unit Geometries Top Row: Tetrahedral with 4 angled (4/8 peg)

Middle Row: Tri-Bi with 3 radial & 2 polar pegs

Bottom Row: Octahedral with 4 radial & 2 polar pegs
Unit Geometries Top Row*: 12 coordinate center with 6 radial & 6 12 coordinate pegs

Middle Row: 12 coordinate center with 4 radial & 8 4/8 coordinate pegs

Bottom Row: 8 coordinate center with 8 4/8 coordinate pegs
Unit Geometries Image*: Examples of non-VSEPR geometries including Germanium and Lanthanum series atoms



Any Unit atom can show univalence using 1 of the 3 different pegs. Combinations of these 3 pegs can produce any geometry from divalent to trigonal up to octahedral.

Watch the video below to see how easy it is to make any molecular geometry from any Unit atom.

Univalent Atoms


Divalent Atoms


Trigonal/Trigonal Bipyramidal Atoms


Tetrahedral/Trigonal Pyramidal Atoms