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In Thoedor Benfrey's periodic table (1960) the elements spiral out in two dimensions starting from hydrogen folding their way around two islands, the Transition Metal s & Lanthanide s and Actinide s. A Superactinide island is already slotted in. In the Chemical Galaxy (2004) the elements Spiral out in a similar way. In the Extended Periodic Table , suggested by Glenn T. Seaborg in 1969, yet unknown elements are included up to Atomic Number 218. Helium is placed in the Group 2 Element s Timmothy Stowe created the physicist's periodic table. This table is three-dimensional and the three axes represent the Principal Quantum Number , Orbital Quantum Number , and orbital Magnetic Quantum Number . Helium is again a Group 2 Element . Paul Giguere's 3-D periodic table consists of 4 billboards with the elements written on the front and the back. The first billboard has the Group 1 Element s on the front and the Group 2 Element s at the back with hydrogen and helium omitted altogether. At a 90° angle the second billboard contains the groups 13 to 18 front and back. Two more billboard each making 90° angles contain the other elements. In the research field of Superatoms , clusters of atoms have properties of single atoms of another element. It is suggested to extend the periodic table with a second layer to be occupied with these Cluster Compound s. In a commentary R.L. Rich proposes a periodic table where elements appear more than once when appropriate. He notes that hydrogen shares properties with Group 1 Element s based on Valency , with Group 17 Element s because hydrogen is a non-metal but also with the Carbon group based on similarities in chemical bonding to transition metals and a similar Electronegativity . In this rendition of the periodic table Carbon and Silicon also appear in the same group as Titanium and Zirconium . EXTERNAL LINKS
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