a synthetic chemical element with atomic number 105, originally named after Otto Hahn but now officially named dubnium.
Named in 1970 to honor Otto Hahn (1879-1968), German nuclear chemist who discovered nuclear fission; the name was later changed to dubnium by international agreement in 1997.
This element has an identity crisis—it was briefly called hahnium to honor Hahn's discovery of fission, but international chemistry committees renamed it dubnium after a Soviet city, showing how even periodic table names can be contested!
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