117Ts

Tennessine

Unknown propertiesunknownblock p

The second-to-last element ever made, requiring a berkelium target grown in Tennessee and flown to Russia before it could decay away.

Atomic number	117
Mass number (longest-lived isotope)	294 g/mol
This element has no stable isotope, so it has no standard atomic weight. The figure above is the mass number of its longest-lived isotope — a convention, not a measurement of a natural mixture.
Group · period	17 · 7
Electron configuration	[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵

About Tennessine

Tennessine exists because Oak Ridge could make 22 mg of berkelium-249 and Dubna could fire calcium-48 at it. The target had a 330-day half-life, so the material was shipped to Russia and used immediately; the 2010 campaign yielded six atoms. The name honours the state of Tennessee for Oak Ridge, Vanderbilt and the University of Tennessee, and it takes the -ine ending because element 117 sits in the halogen column. Whether it deserves that ending chemically is another matter: relativistic calculations suggest tennessine would not readily form the −1 anion that defines a halogen, and might behave more like a metal, which is why no category is asserted here.

Use 294 g/mol in these solvers

Moles from Mass (n = m/M)

n = \frac{m}{M}

Opens with M = 294 g/mol already filled in

Gas Density from Molar Mass

\rho = \frac{PM}{RT}

Opens with M = 294 g/mol already filled in

Faraday's Law of Electrolysis (m = QM/nF)

m = \frac{Q M}{n F}

Opens with M = 294 g/mol already filled in

Ion Concentration as CaCO₃ Equivalent

C_{\mathrm{CaCO_3}} = C_{\mathrm{ion}} \times \frac{50.04}{\mathrm{EW}}

Opens with EW = 294 g/mol already filled in

Acid Feed to Reduce Alkalinity

\dot m = \frac{\Delta \mathrm{Alk} \, Q \times \frac{\mathrm{EW}}{50.04}}{p/100\%}

Opens with EW = 294 g/mol already filled in

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