Hahnium (element 105)

Also known as Ha

Cause of death

Killed by regulation

Made by

International Union of Pure and Applied Chemistry

IUPAC settled the naming dispute over element 105 by awarding it to the Russian laboratory as dubnium.

Berkeley made element 105 in 1970 and proposed hahnium, after Otto Hahn. Dubna had got there first and proposed nielsbohrium. American textbooks then printed hahnium for a quarter of a century while Soviet ones printed something else, which is how the periodic table acquired a Cold War front line. IUPAC ended the Transfermium Wars in 1997 by naming element 105 dubnium, after the Russian town, and hahnium after nothing at all.