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Uranium - Wikipedia
https://en.wikipedia.org/wiki/Uranium
All imagesAppearancesilvery gray metallic; corrodes to a spalling black oxide coat in airPhase at STPsolidWikipediahttps://en.wikipedia.org/wiki/UraniumUranium - WikipediaUranium is a chemical element; it has 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. The half-life of this decay varies between 159,200 and 4.5 billion ye… See more
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Promethium - Wikipedia
https://en.wikipedia.org/wiki/Promethium
OverviewHistoryPropertiesOccurrenceProductionApplicationsPrecautionsBibliographyIn 1902, Czech chemist Bohuslav Brauner found out that the differences in properties between neodymium and samarium were the largest between any two consecutive lanthanides in the sequence then known; as a conclusion, he suggested there was an element with intermediate properties between them. This prediction was supported in 1914 by Henry Moseley who, having discover… Appearance: metallic Mass number: [145] Atomic number (Z): 61
Appearance: metallic
Mass number: [145]
Atomic number (Z): 61
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Uranium - Element information, properties and uses
https://www.rsc.org/periodic-table/element/92/uranium
WEBElement Uranium (U), Group 20, Atomic Number 92, f-block, Mass 238.029. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
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Promethium - Element information, properties and uses
https://www.rsc.org/periodic-table/element/61/promethium
WEBElement Promethium (Pm), Group 19, Atomic Number 61, f-block, Mass [145]. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
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Promethium | Rare Earth Element, Atomic Number 61
https://www.britannica.com/science/promethium
WEBMar 1, 2024 · atomic number: 61: most stable isotope (145) melting point: 1,042 °C (1,908 °F) boiling point: 3,000 °C (5,432 °F) (estimated) specific gravity: 7.264 (at 24 °C [75 °F]) …
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Promethium - New World Encyclopedia
https://www.newworldencyclopedia.org/entry/Promethium
WEBPromethium (chemical symbol Pm, atomic number 61) is a metallic element that is a member of the lanthanide series of chemical elements. All of its isotopes are radioactive. …
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Uranium (U) - Periodic Table
https://periodictable.chemicalaid.com/element.php/U?lang=en
WEBUranium 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. …
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