Isotopes of uranium
From Wikipedia
Uranium (U)
Standard atomic mass: 238.02891(3) u
The element has no stable isotopes. However, it has a characteristic terrestrial isotopic composition and thus an atomic mass can be given. General Name, Symbol, Number uranium, U, 92 Chemical series actinides Group, Period, Block ?, 7, f Appearance silvery gray metallic Atomic mass 238. ...
The atomic mass unit (amu), unified atomic mass unit (u), or dalton (Da), is a small unit of mass used to express atomic masses and molecular masses. ...
Table
| Z(p) | N(n) | isotopic mass (u) | nuclide symbol | representative isotopic composition (mole fraction) | range of natural variation (mole fraction) |
|---|---|---|---|---|---|
| 92 | 125 | 217.02437(9) | U-217 | ||
| 92 | 126 | 218.02354(3) | U-218 | ||
| 92 | 127 | 219.02492(6) | U-219 | ||
| 92 | 128 | 220.02472(22)# | U-220 | ||
| 92 | 129 | 221.02640(11)# | U-221 | ||
| 92 | 130 | 222.02609(11)# | U-222 | ||
| 92 | 131 | 223.02774(8) | U-223 | ||
| 92 | 132 | 224.027605(27) | U-224 | ||
| 92 | 133 | 225.029391(12) | U-225 | ||
| 92 | 134 | 226.029339(14) | U-226 | ||
| 92 | 135 | 227.031156(18) | U-227 | ||
| 92 | 136 | 228.031374(16) | U-228 | ||
| 92 | 137 | 229.033506(6) | U-229 | ||
| 92 | 138 | 230.033940(5) | U-230 | ||
| 92 | 139 | 231.036294(3) | U-231 | ||
| 92 | 140 | 232.0371562(24) | U-232 | ||
| 92 | 141 | 233.0396352(29) | U-233 | ||
| 92 | 142 | 234.0409521(20) | U-234 | [0.000054(5)] | 0.000050-0.000059 |
| 92 | 143 | 235.0439299(20) | U-235 | [0.007204(6)] | 0.007198-0.007207 |
| 92 | 144 | 236.045568(2) | U-236 | ||
| 92 | 145 | 237.0487302(20) | U-237 | ||
| 92 | 146 | 238.0507882(20) | U-238 | [0.992742(10)] | 0.992739-0.992752 |
| 92 | 147 | 239.0542933(21) | U-239 | ||
| 92 | 148 | 240.056592(6) | U-240 | ||
| 92 | 149 | 241.06033(32)# | U-241 | ||
| 92 | 150 | 242.06293(22)# | U-242 |
Properties In physics, the proton (Greek proton = first) is a subatomic particle with an electric charge of one positive fundamental unit (1. ... Properties In physics, the neutron is a subatomic particle with no net electric charge and a mass of 939. ...
Notes
- Evaluated isotopic composition is for most but not all commercial samples.
- The precision of the isotope abundances and atomic mass is limited through variations. The given ranges should be applicable to any normal terrestrial material.
- Geologically exceptional samples are known in which the isotopic composition lies outside the reported range. The uncertainty in the atomic mass may exceed the stated value for such specimens.
- Commercially available materials may have been subjected to an undisclosed or inadvertent isotopic fractionation. Substantial deviations from the given mass and composition can occur.
- Values marked # are not purely derived from experimental data, but at least partly from systematic trends.
- Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values from Ame2003 denote one standard deviation. Values from IUPAC are expanded uncertainties.
References
- Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
- Isotopic compositions and standard atomic masses from Atomic Weights of the Elements: Review 2000 (IUPAC Technical Report). Pure Appl. Chem., Vol. 75, No. 6, pp. 683-800, (2003).
| Isotopes of protactinium | Isotopes of uranium | Isotopes of neptunium |
