Element · Layer 0, Atomic number 117
Tennessine
A synthetic superheavy element named after the US state of Tennessee, made in 2010 from berkelium and calcium.
Also called element 117, ununseptium
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About
Tennessine is element 117, the second-heaviest element known. Making it took an international relay. The High Flux Isotope Reactor at Oak Ridge in Tennessee produced a tiny amount of rare berkelium-249, which was flown to Dubna, Russia, and bombarded with calcium-48 nuclei. In 2010 the team announced six atoms of the new element. It was named in 2016 after Tennessee, home of Oak Ridge, Vanderbilt University and the University of Tennessee.
Tennessine atoms last only hundredths of a second. It sits among the halogens, below astatine, but it is predicted to behave more like a metal than like chlorine or iodine.
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276 blocks