Elementii
The Table
117 Ts 294 u

Element 117 · Solid at room temperature

Tennessine

Chemistry not yet confirmed dataset label: “unknown, probably metalloid” — too few atoms ever made to confirm its chemistry
Ts

Tennessine is a superheavy artificial chemical element with an atomic number of 117 and a symbol of Ts. Also known as eka-astatine or element 117, it is the second-heaviest known element and penultimate element of the 7th period of the periodic table. As of 2016, fifteen tennessine atoms have been observed: six when it was first synthesized in 2010, seven in 2012, and two in 2014.

Summary from the source dataset, derived from Wikipedia (CC BY-SA 3.0) · original article

Atomic mass

294u

Density

7.17g/cm³

Melts

723 K

Boils

883 K

The units on this page — explained by Unitii

Tennessine's family

Elements in the same column share their outer-electron count, so they behave alike.

Source

Discovered by Joint Institute for Nuclear Research.

Periodic-Table-JSON (Bowserinator and contributors); element summaries derived from Wikipedia · CC BY-SA 3.0 · snapshot retrieved 2026-08-21

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