The Coronium Problem

Gallium, scandium, and germanium were found within fifteen years of Mendeleev's prediction and matched his descriptions with astonishing quantitative precision. Coronium was not found, because it does not exist. Mendeleev predicted it from the same table, using the same method, with the same confidence. He was extrapolating beyond the validated range of the periodic structure, into a region where the law he had discovered no longer applied, and he could not tell the difference from inside because the internal experience of the procedure is identical whether the gap being filled lies at the dense center of the structure or at its thinning edge. The coronium problem is the name for this structural hazard: that a predictive system generates its fictions and its facts through identical machinery, at identical confidence levels, with no internal signal marking the boundary between them.