I DON'T KNOW sorry
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Three dimensional shapes, regular polyhedra.
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Geometric relationsThe cube is unique among the Platonic solids for being able to tile Euclidean space regularly. It is also unique among the Platonic solids in having faces with an even number of sides and, consequently, it is the only member of that group that is a zonohedron (every face has point symmetry).The cube can be cut into 6 identical square pyramids. If these square pyramids are then attached to the faces of a second cube, a rhombic dodecahedronis obtained.
iodine and Astatine
No. The inverses do not belong to the group.
In a venn diagram there is one circle for a group, another circle for a different group, and where they overlap is things that belong to both groups. Some include the space outside the circles where there are items that don't belong in any group.
It belongs in the irrational group of numbers.