Knights move relationships

The knight s move relationship is perhaps the most mysterious one among all the unusual relationships involving the periodic table (figure 10.11). It takes its name from the knight s move in the game of chess, meaning a move of one step in any... 

FIGURE 10.11 Elements that show knight s move relationships. For example, zinc and tin or silver and thaUium. 

FIGUKE 10.12 The inorganic chemist s periodic table,designed by G.Rayner Can-ham. Shadings indicate relationships ( ) and (n + 10) relationships diagonal relationships knight s move relationships aluminum—iron link actinoid relationship lanthanide-actinide relationship combination elements pseudoelements. 

Laing made the discovery of the knight s move relationship in the course of teaching a chemistry course for engineers that caused him to emphasize the similarity between zinc and tin (M. Laing, personal communication). 

One more periodic chart [6] shows in one place some additional similarities, mentioned separately in this text. It has the pseudohalogen CN with the halogens, NH4 with the alkali metals, and some p-block elements and early actinoids with the d-block. It also suggests the similarity of Al to Fe (as Fe ) (although it could well include Cr too), as well as some diagonal and knight s move (Cu through In, Bi etc.) relationships. We now know Uun as Ds and Uuu as Rg. See Fig. A. 11. 

---