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Canadian Address:

169 Lexington Court, Unit I

Waterloo, ON, N2J 4R9


US Address:

Niagara Falls, NY 14305

Canadian/International ship from Waterloo; US orders from Buffalo, NY.

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Classroom Demonstration Models

Unit style molecular models with 45mm diameter atom spheres.

Builds really BIG organic/inorganic models.

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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.

Unit Peg Placements & Atom Geometries

Examples of Where Used

Unit Pegs

 Polar Pegs

  1. Use one for univalent atoms
  2. One at each pole for linear atoms
  3. Use with Radial peg for Tri-Bi

Radial Pegs

  1. Use one for univalent atoms
  2. Use 2 for 30, 45, 90, 120, 180 degree
  3. Use with 4/8 for odd angles

Angled (4/8) Pegs

  1. Use 4 for tetrahedral geometry
  2. Use 8 for 8 coordinate
Unit Geometries

  Left Column: Tetrahedral with 4 angled (4/8 )


  Centre Column: Tri-Bi with 3 radial, 2 polar


  Right Column: Octahedral w/ 4 radial, 2 polar

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