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The card for when there are too many options. Or, maybe when all the options suck equally...?
On the front, is the atomic symbol "Um", and we can't decide on the atomic number or weight because this is "The Element of Indecision".
On the back, "As of 2019, there are only 118 known elements. 98 are known to occur naturally. Larger atoms are predicted, and they even have names, such as unbinilium with 120 protons and unbihexium with 126 protons. To find new elements, lighter elements are shot at heavier ones, but current technology cannot handle these predicted elements."