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On the front is the atomic symbol "Ah" with an atomic number well past the known, maximum, theoretical limit and an atomic weight to match.
On the back, "As of 2019, there are only 118 known elements. 98 are known to occur naturally. In the Periodic Table of Elements, the elements are represented in a grid. In each position in the grid, the quantity of protons in the atom, or element’s atomic number, is indicated above the element’s symbol, while the atom weight is below."