In July 2018, an experiment aboard the International Space Station cooled a cloud of atoms of which chemical element to one ten-millionth of one Kelvin above absolute zero, forming a Bose-Einstein Condensate in space?

Explanation

NASA reported in July 2018 that its Cold Atom Laboratory aboard the International Space Station had produced Bose–Einstein condensates from rubidium atoms at temperatures as low as 100 nanokelvin. This equals 10⁻⁷ K, or one ten-millionth of a kelvin above absolute zero. The other listed elements were not the atoms identified in that report.