Atomic Symbol Uus
Atomic Number 117
Atomic Weight unknown
presumably a solid at 298 K
Color unknown, but probably metallic and silvery white or grey in appearance

Ununseptium is a synthetic element that is not present in the environment. Isolation of an any quantity of ununseptium has never been achieved, and thus ununseptium has no known uses. The reactivity of ununseptium is unknown, but is assumed to be similar to astatine and iodine.

Ununseptium has never been synthesized.

No name has yet been suggested for element 117, which is therefore called ununseptium, from the Latin roots un for one and sept for seven, under a convention for neutral temporary names proposed by the International Union of Pure and Applied Chemistry (IUPAC) in 1980.

ununhexium <-- ununseptium --> ununoctium

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