Ununseptium

Atomic properties
Atomic number	117
Electron configuration	[Rn] 5f14 6d10 7s2 7p5
Miscellaneous
CAS number	87658-56-8
	Where appropriate, and unless otherwise stated, data are given for 100 kPa (1 bar) and 298.15 K (25 °C).
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ununhexium ← ununseptium → ununoctium

At
↑
Uus
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Ununseptium (symbol: Uus) is a purported chemical element in group 17 of the periodic table. Its preparation was reported by a team from the Flerov Laboratory of Nuclear Reactions in April 2010, based on the fusion of berkelium-249 with calcium-48 nuclei:^[1]

24997Bk(4820Ca,3n)294117Uus t_½ = 78(+370-36) ms

24997Bk(4820Ca,4n)293117Uus t_½ = 14(+11-4) ms

Notes and references

↑ Oganessian, Yu. Ts.; Abdullin, F. Sh.; Bailey, P. D.; Benker, D. E.; Bennett, M. E.; Dmitriev, S. N.; Ezold, J. G.; Hamilton, J. H., et al. Synthesis of a New Element with Atomic Number Z = 117. Phys. Rev. Lett. 2010, 104 (14), 142502. DOI: 10.1103/PhysRevLett.104.142502.

See also the corresponding article on Wikipedia.

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