The Janet Periodic Table (first printed 1928) is also known as the Left Step Table. This table may be re-arranged as four square matrices. Each matrix is a different size.
If the cells of each matrix are represented as a cube (block), then the matrices may be stacked vertically to form a stepped pyramid with four “levels”. Each level is a matrix. Each block represents a chemical element and the stepped pyramid becomes a 3 dimensional Table of Elements.
The central four blocks on all levels forms the “core” of the table corresponding to atomic ‘s’ orbitals. The remaining blocks may be considered to be arranged as concentric square rings surrounding the core corresponding to atomic ‘p,d,f’ orbitals.
It is also possible to view vertical sections cut through the pyramid to reveal “vertical relationships” of the elements.
Is a 3D Periodic Table useful?
Reference; http://newstuff77.weebly.com 01 The Pyramid Periodic Table