Dufour's Elementree (1990) in 2D

[Rene]

Dufour’s Elementree is here https://www.meta-synthesis.com/webbook/35_pt/pt_database.php?PT_id=39, and attached.

I’ve attached a 2D version.

I was surprised by its lack of symmetry, caused by the awkward placement of He, and the assignment of H as floating above Li and Be. Hydrogen is as much subject to the periodic law as any other element.

Without aligning H over Li, and He over Be, I am not sure that Elementree can be made symmetrical. I would be pleased to stand corrected.

René