Uranium Atomic Mass


Name: Uranium Symbol: U Atomic Number: 92 Atomic Mass: 238.0289 amu Melting Point: 1132.0 °C (1405.15 K, 2069.6 °F) Boiling Point: 3818.0 °C (4091.15 K, 6904.4 °F) Number of Protons/Electrons: 92 Number of Neutrons: 146 Classification: Rare Earth Crystal Structure: Orthorhombic Density @ 293 K: 18.95 g/cm 3 Color: silverish Atomic Structure. Oct 27, 2010 Uranium has three common isotopes. If the abundance of 234U is 0.01%, the abundance of 235U is.71% and the abundance of 238U is 99.28%, what is the average atomic mass of uranium. Please help me figure this out. The periodic table Uranium has the mass of 238.03 and is #92 if that is any help.

IsotopeAtomic mass (Da)Isotopic abundance (amount fraction)
234U 234.040 950(8)0.000 054(5)
235U 235.043 928(8)0.007 204(6)
238U 238.050 79(1)0.992 742(10)

In 1969, the Commission recommended Ar(U) = 238.029(1) for the atomic weight of Ubased on mass-spectrometric determinations and a careful analysis of the variability of x(235U) in nature. In 1979, the Commission took note of later studies of the variations of the 235U abundance in normal sources, whichjustified a more precise value for the standard atomic weight, thus leadingto Ar(U) = 238.0289(1). The atomic weight and uncertainty of uranium were changed to 238.028 91(3) in 1999 on the basis of new calibrated mass-spectrometric measurements.

That value applies to uranium as found in normal terrestrial sources, except as discovered in one locality in south-west Africa (Gabon at Oklo), hence the annotation 'g'. Uranium is used in the nuclearfuel cycle either enriched or depleted in 235U, hence the annotation 'm'.

All uranium isotopes are α-emitters. Isotopes 235U and 238U are primordial with the 235U abundance decliningvery gradually in geological time because of its faster decay. 234U, itself a decay product of 238U, is in equilibriumestablished by the ratio of the half-lives. 235U decays by a branched series ending with 207Pb,238U (and 234U) by a similar series ending in 206Pb. The 238U–206Pb and the 235U–207Pb decay systems are of fundamental importance in geochronology.

SOURCEAtomic weights of the elements: Review 2000 by John R de Laeter et al. Pure Appl. Chem. 2003 (75) 683-800
© IUPAC 2003

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Ar(U) = 238.028 91(3) since 1999
The name derives from the planet Uranus, which in Roman mythology was 'Father Heaven'. TheGerman chemist Martin-Heinrich Klaproth discovered the element in 1789, following William Hershel's discovery of the planet in 1781. The metallic uranium was first isolated by the French chemist Eugène-Melchior Peligot in 1841.

Isotopic reference materials of uranium.

Atomic Mass Of Uranium 238

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Please provide values below to convert Atomic mass unit [u] to kilogram [kg], or vice versa.

Atomic Mass Unit to Kilogram Conversion Table

Atomic Mass Unit [u]Kilogram [kg]
0.01 u1.6605402E-29 kg
0.1 u1.6605402E-28 kg
1 u1.6605402E-27 kg
2 u3.3210804E-27 kg
3 u4.9816206E-27 kg
5 u8.3027009999999E-27 kg
10 u1.6605402E-26 kg
20 u3.3210804E-26 kg
50 u8.3027009999999E-26 kg
100 u1.6605402E-25 kg
1000 u1.6605402E-24 kg

How to Convert Atomic Mass Unit to Kilogram

What Is Uranium Atomic Mass

1 u = 1.6605402E-27 kg
1 kg = 6.0221366516752E+26 u

Uranium 235 Atomic Mass

Example: convert 15 u to kg:
15 u = 15 × 1.6605402E-27 kg = 2.4908103E-26 kg


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