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Americium is a synthetic chemical element; it has symbol Am and atomic number 95. It is radioactive and a transuranic member of the actinide series in the periodic table, located under the lanthanide element europium and was thus named after the Americas by analogy.
Berkelium is a synthetic chemical element; it has symbol Bk and atomic number 97. It is a member of the actinide and transuranium element series. It is named after the city of Berkeley, California, the location of the Lawrence Berkeley National Laboratory where it was discovered in December 1949. Berkelium was the fifth transuranium element discovered after neptunium, plutonium, curium and americium.
Curium is a synthetic chemical element; it has symbol Cm and atomic number 96. This transuranic actinide element was named after eminent scientists Marie and Pierre Curie, both known for their research on radioactivity. Curium was first intentionally made by the team of Glenn T. Seaborg, Ralph A. James, and Albert Ghiorso in 1944, using the cyclotron at Berkeley. They bombarded the newly discovered element plutonium with alpha particles. This was then sent to the Metallurgical Laboratory at University of Chicago where a tiny sample of curium was eventually separated and identified. The discovery was kept secret until after the end of World War II. The news was released to the public in November 1947. Most curium is produced by bombarding uranium or plutonium with neutrons in nuclear reactors – one tonne of spent nuclear fuel contains ~20 grams of curium.
Plutonium hexafluoride is the highest fluoride of plutonium, and is of interest for laser enrichment of plutonium, in particular for the production of pure plutonium-239 from irradiated uranium. This isotope of plutonium is needed to avoid premature ignition of low-mass nuclear weapon designs by neutrons produced by spontaneous fission of plutonium-240.
Americium(III) chloride or americium trichloride is the chemical compound composed of americium and chlorine with the formula AmCl3. This salt forms pink hexagonal crystals. In the solid state each americium atom has nine chlorine atoms as near neighbours, at approximately the same distance, in a tricapped trigonal prismatic configuration.
Indium trihydride is an inorganic compound with the chemical formula. It has been observed in matrix isolation and laser ablation experiments. Gas phase stability has been predicted. The infrared spectrum was obtained in the gas phase by laser ablation of indium in presence of hydrogen gas InH3 is of no practical importance.
Berkelium forms a number of chemical compounds, where it normally exists in an oxidation state of +3 or +4, and behaves similarly to its lanthanide analogue, terbium. Like all actinides, berkelium easily dissolves in various aqueous inorganic acids, liberating gaseous hydrogen and converting into the trivalent oxidation state. This trivalent state is the most stable, especially in aqueous solutions, but tetravalent berkelium compounds are also known. The existence of divalent berkelium salts is uncertain and has only been reported in mixed lanthanum chloride-strontium chloride melts. Aqueous solutions of Bk3+ ions are green in most acids. The color of the Bk4+ ions is yellow in hydrochloric acid and orange-yellow in sulfuric acid. Berkelium does not react rapidly with oxygen at room temperature, possibly due to the formation of a protective oxide surface layer; however, it reacts with molten metals, hydrogen, halogens, chalcogens and pnictogens to form various binary compounds. Berkelium can also form several organometallic compounds.
Americium(III) oxide or americium sesquioxide is an oxide of the element americium. It has the empirical formula Am2O3. Since all isotopes of americium are only artificially produced, americium (III) oxide has no natural occurrence. The colour depends on the crystal structure, of which there are more than one. It is soluble in acids.
Curium compounds are compounds containing the element curium (Cm). Curium usually forms compounds in the +3 oxidation state, although compounds with curium in the +4, +5 and +6 oxidation states are also known.
Einsteinium compounds are compounds that contain the element einsteinium (Es). These compounds largely have einsteinium in the +3 oxidation state, or in some cases in the +2 and +4 oxidation states. Although einsteinium is relatively stable, with half-lives ranging from 20 days upwards, these compounds have not been studied in great detail.
Americium compounds are compounds containing the element americium (Am). These compounds can form in the +2, +3, and +4, although the +3 oxidation state is the most common. The +5, +6 and +7 oxidation states have also been reported.
Ytterbium(II) fluoride is a binary inorganic compound of ytterbium and fluorine with the chemical formula YbF2.
Berkelium(III) oxide is a binary inorganic compound of berkelium and oxygen with the chemical formula Bk
2O
3.
Einsteinium fluoride is a binary inorganic chemical compound of einsteinium and fluorine with the chemical formula EsF3.
Einsteinium(II) chloride is a binary inorganic chemical compound of einsteinium and chlorine with the chemical formula EsCl2.
Einsteinium(II) bromide is a binary inorganic chemical compound of einsteinium and bromine with the chemical formula EsBr2.
Berkelium(II) oxide is a binary inorganic compound of berkelium and oxygen with the chemical formula BkO.
Americium nitride is a binary inorganic compound of americium and nitride with the chemical formula AmN.
Neptunium tetrabromide is a binary inorganic compound of neptunium metal and bromine with the chemical formula NpBr4.
Thorium triiodide is a binary inorganic compound of thorium metal and iodine with the chemical formula ThI3.
References
- ↑ Yaws, Carl L. (6 January 2015). The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals: Physical Properties for More Than 54,000 Organic and Inorganic Chemical Compounds, Coverage for C1 to C100 Organics and Ac to Zr Inorganics. Gulf Professional Publishing. p. 688. ISBN 978-0-12-801146-1 . Retrieved 9 February 2024.
- ↑ Roddy, J. W. (1 December 1973). "The actinide hydrides: The americium-hydrogen system". Journal of Inorganic and Nuclear Chemistry . 35 (12): 4141–4148. doi:10.1016/0022-1902(73)80401-4. ISSN 0022-1902 . Retrieved 9 February 2024.
- ↑ Perry, Dale L. (19 April 2016). Handbook of Inorganic Compounds. CRC Press. p. 502. ISBN 978-1-4398-1462-8 . Retrieved 9 February 2024.
- ↑ Hummel, Wolfgang; Berner, Urs; Curti, Enzo; Pearson, F. J.; Thoenen, Tres (2002). Nagra/PSI Chemical Thermodynamic Data Base 01/01. Universal-Publishers. p. 123. ISBN 978-1-58112-620-4 . Retrieved 9 February 2024.
- ↑ Silva, R. J.; Bidoglio, G.; Robouch, P. B.; Puigdomenech, I.; Wanner, H.; Rand, M. H. (2 December 2012). Chemical Thermodynamics of Americium. Newnes. p. 100. ISBN 978-0-444-59935-3 . Retrieved 9 February 2024.
- ↑ Morss, L. R.; Edelstein, Norman M.; Fuger, Jean (31 December 2007). The Chemistry of the Actinide and Transactinide Elements (3rd ed., Volumes 1-5). Springer Science & Business Media. pp. 1317–1318. ISBN 978-1-4020-3598-2 . Retrieved 5 February 2024.
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