Element 117 · Solid at room temperature
Tennessine
Tennessine is atom number 117 — every Tennessine atom has exactly 117 protons in its center, and that number is what makes it Tennessine and nothing else. Its symbol is Ts. At room temperature it is a solid.
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
Tennessine sits in period 7, group 17 of the p-block. Its 117 electrons fill shells of 2, 8, 18, 32, 32, 18, 7 — written as *[Rn] 5f14 6d10 7s2 7p5. Its electronegativity is — on the Pauling scale. The outermost shell holds 7 electrons — the ones that do all the chemistry.
Full configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p5
Electron affinity: 165.9 kJ/mol · Electronegativity (Pauling):
—
Density: 7.17
g/cm³ · melts 723 K · boils 883 K
Values exactly as published — see where the data comes from.
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