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[mass noun] The chemical element of atomic number 105, a very unstable element made by high-energy atomic collisions.
- ‘Nine isotopes of Dubnium are now recognized.’
- ‘Following up on berkelium, dubnium and californium, researchers at the University of Berkely in California, stumbled upon am element with atomic number 117 about a year ago.’
- ‘Similar controversies attended the much more recent synthesis and naming of the heaviest element of the group, dubnium.’
- ‘For instance, after five alpha particles have been emitted we are left with element 105, which is called dubnium.’
1990s: modern Latin, from Dubna in Russia, site of the Joint Nuclear Institute.
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