# 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.

Isotope | Atomic mass (Da) | Isotopic abundance (amount fraction) |
---|---|---|

^{234}U | 234.040 950(8) | 0.000 054(5) |

^{235}U | 235.043 928(8) | 0.007 204(6) |

^{238}U | 238.050 79(1) | 0.992 742(10) |

In 1969, the Commission recommended *A*_{r}(U) = 238.029(1) for the atomic weight of Ubased on mass-spectrometric determinations and a careful analysis of the variability of *x*(^{235}U) in nature. In 1979, the Commission took note of later studies of the variations of the ^{235}U abundance in normal sources, whichjustified a more precise value for the standard atomic weight, thus leadingto *A*_{r}(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 ^{235}U, hence the annotation 'm'.

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

*Pure Appl. Chem.*2003 (75) 683-800

© IUPAC 2003

Youtube video to audio converter. CIAAW

**Uranium***A*_{r}(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

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 u | 1.6605402E-29 kg |

0.1 u | 1.6605402E-28 kg |

1 u | 1.6605402E-27 kg |

2 u | 3.3210804E-27 kg |

3 u | 4.9816206E-27 kg |

5 u | 8.3027009999999E-27 kg |

10 u | 1.6605402E-26 kg |

20 u | 3.3210804E-26 kg |

50 u | 8.3027009999999E-26 kg |

100 u | 1.6605402E-25 kg |

1000 u | 1.6605402E-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