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3 paź 2024 · Uranium, radioactive chemical element of the actinoid series of the periodic table, atomic number 92. It is an important nuclear fuel. It is a dense, hard metallic element that is silvery white in color. It is ductile, malleable, and capable of taking a high polish.
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- Uranium
There are 27 known isotopes of uranium ranging in atomic weights 217–219, 222–240 and 242, with half-lives of from billions of years to a few nanoseconds. Naturally occurring uranium consists of three major isotopes: 238 U (99.28% abundance), 235 U (0.71%), and 234 U (0.0054%).
Element Uranium (U), Group 20, Atomic Number 92, f-block, Mass 238.029. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
Uranium is the 92nd element in the periodic table and has a symbol of U and atomic number of 92. It has an atomic weight of (238.02891) and a mass number of 238. Uranium has ninety-two protons and one hundred forty-six neutrons in its nucleus, and ninety-two electrons in seven shells.
2 238U has 146 neutrons, for a total atomic weight of approximately 238, making it the highest atomic weight of any naturally occurring element. It is not the most dense of elements, but its density is almost twice that of lead. Uranium is radioactive and in nature has three primary isotopes with different numbers of neutrons. Natural uranium,
Isotope Relative Atomic Mass Isotopic Composition Standard Atomic Weight Notes ; 92 : U : 233 : 233.039 6355(29) 234 : 234.040 9523(19) 0.000 054(5) 238.028 91(3)
Uranium. In 1969, the Commission recommended Ar (U) = 238.029 (1) for the atomic weight of U based on mass-spectrometric determinations and a careful analysis of the variability of x (235 U) in nature.