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Classroom Demonstration Models

Unit style molecular models with 45mm diameter atoms.

Really BIG models visible in large Lecture Halls.

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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 (On Right)

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

Radial Pegs (Middle)

  1. Use 2 for 30, 45, 90, 120 or 180 degree

Angled Pegs (On Left)

  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