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  2. Uranium - Wikipedia

    en.wikipedia.org/wiki/Uranium

    Uranium is a naturally occurring element found in low levels in all rock, soil, and water. It is the highest-numbered element found naturally in significant quantities on Earth and is almost always found combined with other elements. [12] Uranium is the 48th most abundant element in the Earth’s crust. [60]

  3. Abundance of elements in Earth's crust - Wikipedia

    en.wikipedia.org/wiki/Abundance_of_elements_in...

    Abundance (atom fraction) of the chemical elements in Earth's upper continental crust as a function of atomic number; [5] siderophiles shown in yellow. Graphs of abundance against atomic number can reveal patterns relating abundance to stellar nucleosynthesis and geochemistry.

  4. List of countries by uranium reserves - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    World uranium reserves in 2010. Uranium reserves are reserves of recoverable uranium, regardless of isotope, based on a set market price. The list given here is based on Uranium 2020: Resources, Production and Demand, a joint report by the OECD Nuclear Energy Agency and the International Atomic Energy Agency. [1] Figures are given in metric ...

  5. Isotopes of uranium - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_uranium

    All three isotopes are radioactive (i.e., they are radioisotopes), and the most abundant and stable is uranium-238, with a half-life of 4.4683 × 10 9 years (about the age of the Earth). Uranium-238 is an alpha emitter, decaying through the 18-member uranium series into lead-206.

  6. Uranium ore - Wikipedia

    en.wikipedia.org/wiki/Uranium_ore

    Sample of uranium ore. Uranium ore deposits are economically recoverable concentrations of uranium within Earth's crust. Uranium is one of the most common elements in Earth's crust, being 40 times more common than silver and 500 times more common than gold. [1] It can be found almost everywhere in rock, soil, rivers, and oceans. [2]

  7. Natural abundance - Wikipedia

    en.wikipedia.org/wiki/Natural_abundance

    In physics, natural abundance (NA) refers to the abundance of isotopes of a chemical element as naturally found on a planet. The relative atomic mass (a weighted average, weighted by mole-fraction abundance figures) of these isotopes is the atomic weight listed for the element in the periodic table. The abundance of an isotope varies from ...

  8. US must stop importing uranium from other countries ... - AOL

    www.aol.com/news/us-must-stop-importing-uranium...

    Congressional action could usher in some sweeping changes leading to a resurgence of mining of minerals needed for defense and energy production in the United States.

  9. Natural uranium - Wikipedia

    en.wikipedia.org/wiki/Natural_uranium

    On rare occasions, earlier in geologic history when uranium-235 was more abundant, uranium ore was found to have naturally engaged in fission, forming natural nuclear fission reactors. Uranium-235 decays at a faster rate ( half-life of 700 million years) compared to uranium-238, which decays extremely slowly (half-life of 4.5 billion years).