element 117

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Related to element 117: Element 118

element 117:

see ununseptiumununseptium
, artificially produced radioactive chemical element; symbol Uus; at. no. 117; mass number of most stable isotope 294; m.p., b.p., sp. gr., and valence unknown.
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The special berkelium target material, essential for the synthesis of element 117, was produced over an 18-month-long campaign.
And what an experiment it was: For 150 days, the scientists smashed calcium-48 atoms into berkelium-249 atoms, and at the end of the experiment the team had created exactly six atoms of element 117, according to the Oak Ridge National Laboratory, where some of the other scientists on the project work.
Recently scientists announced the creation of element 117, filling the final vacancy in the periodic table as it is drawn today (SN: 4/24/10, p.