92U

Uranium

Actinidesolidblock f

The heaviest naturally abundant element, the fuel of every power reactor, and the only element that has ever run a nuclear reactor by itself.

Atomic number	92
Standard atomic weight	238.03 g/mol ± 0.01
Group · period	f-block series · 7
Electron configuration	[Rn] 5f³ 6d¹ 7s²

About Uranium

In 1972 French analysts found uranium from the Oklo mine in Gabon that was measurably short of uranium-235 — 0.717 % instead of the invariable 0.720 %. The explanation is that roughly 1.7 billion years ago, when natural enrichment was still around 3 %, groundwater seeping through the ore acted as a moderator and sixteen natural fission reactors ignited, running in pulses for a few hundred thousand years at a few dozen kilowatts. Oklo remains the only known natural reactor, and it doubles as a very long-term field test of whether fission products stay put in geology. Klaproth found uranium in 1789 and named it for the newly discovered planet Uranus; for 150 years its main use was colouring glass a fluorescent yellow-green.

Use 238.03 g/mol in these solvers

Moles from Mass (n = m/M)

n = \frac{m}{M}

Opens with M = 238.03 g/mol already filled in

Gas Density from Molar Mass

\rho = \frac{PM}{RT}

Opens with M = 238.03 g/mol already filled in

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

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

Opens with M = 238.03 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 = 238.03 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 = 238.03 g/mol already filled in

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