hahnium

American  

[hah-nee-uhm] / ˈhɑ ni əm /

noun

Chemistry, Physics.

1. a proposed but never officially adopted name for element 105, which was instead named dubnium. Ha

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hahnium British  

/ ˈhɑːnɪəm /

noun

1. a name once advanced by the American Chemical Society for a transuranic element, artificially produced from californium, atomic no: 105; half-life of most stable isotope, ²⁶² Ha: 40 seconds Now called dubnium

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Etymology

Origin of hahnium

First recorded in 1965–70; named after German chemist Otto Hahn ( def. ); see -ium ( def. )