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Uranium is a chemical element with the symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium radioactively decays, usually by emitting an alpha particle.
3 paź 2024 · In an aqueous solution uranium is most stable as the uranyl ion, which has a linear structure [O=U=O] 2+. Uranium also exhibits a +3 and a +5 state, but the respective ions are unstable. The red U 3+ ion oxidizes slowly even in water that contains no dissolved oxygen.
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 exists in aqueous solutions in the +3, +4, +5, and +6 oxidation states. Oxidation state +6 as the UO 22+ ion (yellow in color) is the most stable state in solution. Uranium in the +5 state as the UO 2+ ion is colorless, quite unstable and disproportionates (reacts with itself) to form the +6 and +4 states.
Properties. Pure uranium is a silvery white, weakly radioactive metal, which is harder than most elements. It is malleable, ductile, slightly paramagnetic, strongly electropositive and is a poor electrical conductor. Uranium metal has very high density, being approximately 70% denser than lead, but slightly less dense than gold.
6 gru 2023 · Uranium, a metallic chemical element found in the periodic table with atomic number 92 and denoted by the symbol U, displays a silvery-white appearance. Each uranium atom is characterized by 92 protons and 92 electrons, including 6 valence electrons. Notably, uranium boasts the highest atomic weight among naturally occurring elements.
Anionic complexes of uranium are present in both acid and alkaline uranium solutions. Strongly basic ion exchangers are generally used to extract these complexes. The hydrate UO 4 · x H 2 O is precipitated from aqueous uranyl nitrate solutions at room temperature by H 2 O 2 :
