Atomic (nucleus - shell) model, Bohr type

For simple and quick representation of a core-shell model on metal panels;
A circular ruler made of metal, which is rotatably mounted on a rubber-covered magnet,
allows concentric circles (of shells) to be quickly drawn on a board by means of notches in correct spacing relations.
As soon as the ruler is removed, the atomic nucleus (+Ze) adheres to the centre.
Now a Z must still be chosen and the corresponding number of electrons "-e" attached to the orbits.

Scope of delivery:
1 DR410-AB1 Circular ruler with magnetic atomic nucleus
30 DR410-AB2 Electron - model.

Dimensions:
Circular ruler: 420 x 40 mm
electrons: D=30 mm