Protactinium (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Protactinium" in English language version.

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Protactinium Archived 7 March 2008 at the Wayback Machine, Argonne National Laboratory, Human Health Fact Sheet, August 2005

aps.org (Global: 1,503^rd place; English: 1,378^th place)

journals.aps.org

Grosse, A. v.; Booth, E. T.; Dunning, J. R. (15 August 1939). "The Fission of Protactinium (Element 91)". Physical Review. 56 (4): 382. Bibcode:1939PhRv...56..382G. doi:10.1103/PhysRev.56.382. Retrieved 17 February 2023.

archive.org (Global: 6^th place; English: 6^th place)

Emsley, John (2003) [2001]. "Protactinium". Nature's Building Blocks: An A-Z Guide to the Elements. Oxford, England, UK: Oxford University Press. pp. 347–349. ISBN 978-0-19-850340-8.
Hammond, C. R. (29 June 2004). The Elements, in Handbook of Chemistry and Physics (81st ed.). CRC press. ISBN 978-0-8493-0485-9.

books.google.com (Global: 3^rd place; English: 3^rd place)

Emsley, John (2003) [2001]. "Protactinium". Nature's Building Blocks: An A-Z Guide to the Elements. Oxford, England, UK: Oxford University Press. pp. 347–349. ISBN 978-0-19-850340-8.
National Research Council (U.S.). Conference on Glossary of Terms in Nuclear Science and Technology (1957). A Glossary of Terms in Nuclear Science and Technology. American Society of Mechanical Engineers. p. 180. Retrieved 25 July 2015.
Crookes, W. (1899). "Radio-Activity of Uranium". Proceedings of the Royal Society of London. 66 (424–433): 409–423. doi:10.1098/rspl.1899.0120. S2CID 93563820.
Shea, William R. (1983) Otto Hahn and the rise of nuclear physics, Springer, p. 213, ISBN 90-277-1584-X.
Cornelis, Rita (2005) Handbook of elemental speciation II: species in the environment, food, medicine & occupational health, Vol. 2, John Wiley and Sons, pp. 520–521, ISBN 0-470-85598-3.
Groult, Henri (2005) Fluorinated materials for energy conversion, Elsevier, pp. 562–565, ISBN 0-08-044472-5.
Hébert, Alain (July 2009). Applied Reactor Physics. Presses inter Polytechnique. p. 265. ISBN 978-2-553-01436-9.
Seitz, Frederick and Turnbull, David (1964) Solid state physics: advances in research and applications, Academic Press, pp. 289–291, ISBN 0-12-607716-9.
Young, David A. (1991) Phase diagrams of the elements, University of California Press, p. 222, ISBN 0-520-07483-1.
Buschow, K. H. J. (2005) Concise encyclopedia of magnetic and superconducting materials, Elsevier, pp. 129–130, ISBN 0-08-044586-1.

ciaaw.org (Global: 8,651^st place; English: low place)

"Standard Atomic Weights: Protactinium". CIAAW. 2017.

degruyter.com (Global: 1,425^th place; English: 1,138^th place)

Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (4 May 2022). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.

digizeitschriften.de (Global: 5,626^th place; English: 8,880^th place)

Fajans, K. & Gohring, O. (1913). "Über die komplexe Natur des Ur X". Naturwissenschaften. 1 (14): 339. Bibcode:1913NW......1..339F. doi:10.1007/BF01495360. S2CID 40667401.

doi.org (Global: 2^nd place; English: 2^nd place)

Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (4 May 2022). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
Pa(II) is known in protactinium monoxide (PaO); see Sellers, Philip A.; Fried, Sherman; Elson, Robert E.; Zachariasen, W. H. (1954). "The Preparation of Some Protactinium Compounds and the Metal". Journal of the American Chemical Society. 76 (23): 5935. Bibcode:1954JAChS..76.5935S. doi:10.1021/ja01652a011.
Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 28. doi:10.1016/C2009-0-30414-6. ISBN 978-0-08-037941-8.
Donohue, J. (1959). "On the crystal structure of protactinium metal". Acta Crystallographica. 12 (9): 697. doi:10.1107/S0365110X59002031.
Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3) 030001. doi:10.1088/1674-1137/abddae.
Meitner, Lise (1918). "Die Muttersubstanz des Actiniums, Ein Neues Radioaktives Element von Langer Lebensdauer". Zeitschrift für Elektrochemie und angewandte physikalische Chemie. 24 (11–12): 169–173. doi:10.1002/bbpc.19180241107. ISSN 0372-8323.
Negre, César; et al. (2010). "Reversed flow of Atlantic deep water during the Last Glacial Maximum" (PDF). Nature. 468 (7320): 84–8. Bibcode:2010Natur.468...84N. doi:10.1038/nature09508. PMID 21048764.
Laing, Michael (2005). "A Revised Periodic Table: With the Lanthanides Repositioned". Foundations of Chemistry. 7 (3): 203. doi:10.1007/s10698-004-5959-9. S2CID 97792365.
Crookes, W. (1899). "Radio-Activity of Uranium". Proceedings of the Royal Society of London. 66 (424–433): 409–423. doi:10.1098/rspl.1899.0120. S2CID 93563820.
Johansson, Sven (1954). "Decay of UX1, UX2, and UZ". Physical Review. 96 (4): 1075–1080. Bibcode:1954PhRv...96.1075J. doi:10.1103/PhysRev.96.1075.
Fajans, K. & Gohring, O. (1913). "Über die komplexe Natur des Ur X". Naturwissenschaften. 1 (14): 339. Bibcode:1913NW......1..339F. doi:10.1007/BF01495360. S2CID 40667401.
Fajans, K.; Morris, D. F. C. (1973). "Discovery and Naming of the Isotopes of Element 91" (PDF). Nature. 244 (5412): 137–138. Bibcode:1973Natur.244..137F. doi:10.1038/244137a0. hdl:2027.42/62921.
von Grosse, Aristid (1928). "Das Element 91; seine Eigenschaften und seine Gewinnung". Berichte der deutschen chemischen Gesellschaft. 61 (1): 233–245. doi:10.1002/cber.19280610137.
Graue, G.; Käding, H. (1934). "Die technische Gewinnung des Protactiniums". Angewandte Chemie. 47 (37): 650–653. Bibcode:1934AngCh..47..650G. doi:10.1002/ange.19340473706.
Grosse, A. V. (1934). "Metallic Element 91". Journal of the American Chemical Society. 56 (10): 2200–2201. Bibcode:1934JAChS..56R2200G. doi:10.1021/ja01325a508.
Myasoedov, B. F.; Kirby, H. W.; Tananaev, I. G. (2006). "Chapter 4: Protactinium". In Morss, L. R.; Edelstein, N. M.; Fuger, J. (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer. Bibcode:2011tcot.book.....M. doi:10.1007/978-94-007-0211-0. ISBN 978-1-4020-3555-5. S2CID 93796247.
Zhang, M. M.; Wang, J. G.; Ma, L.; Gan, Z. G.; Zhang, Z. Y.; Huang, M. H.; Yang, H. B.; Yang, C. L.; Andreyev, A. N.; Yuan, C. X.; Tian, Y. L.; Wang, Y. S.; Wang, J. Y.; Qiang, Y. H.; Wu, X. L.; Xu, S. Y.; Zhao, Z.; Huang, X. Y.; Li, Z. C.; Zhou, H.; Zhang, X.; Xie, G.; Zhu, L.; Guan, F.; Zheng, J. H.; Sun, L. C.; Li, Y. J.; Yang, H. R.; Duan, L. M.; Lu, Z. W.; Huang, W. X.; Sun, L. T.; He, Y.; Xu, H. S.; Niu, Y. F.; He, X. T.; Ren, Z. Z.; Zhou, S. G. (29 May 2025). "Discovery of the α-emitting isotope 210Pa". Nature Communications. 16 (1): 5003. doi:10.1038/s41467-025-60047-2. ISSN 2041-1723. PMC 12123024. PMID 40442068.
Grosse, A. v.; Booth, E. T.; Dunning, J. R. (15 August 1939). "The Fission of Protactinium (Element 91)". Physical Review. 56 (4): 382. Bibcode:1939PhRv...56..382G. doi:10.1103/PhysRev.56.382. Retrieved 17 February 2023.
Tovesson, F.; Hambsch, F.-J; Oberstedt, A.; Fogelberg, B.; Ramström, E.; Oberstedt, S. (August 2002). "The Pa-233 Fission Cross Section". Journal of Nuclear Science and Technology. 39 (sup2): 210–213. Bibcode:2002JNST...39Q.210T. doi:10.1080/00223131.2002.10875076. S2CID 91866777.
Grosse, A. V.; Agruss, M. S. (1934). "The Isolation of 0.1 Gram of the Oxide of Element 91 (Protactinium)". Journal of the American Chemical Society. 56 (10): 2200. Bibcode:1934JAChS..56Q2200G. doi:10.1021/ja01325a507.
Marples, J. A. C. (1965). "On the thermal expansion of protactinium metal". Acta Crystallographica. 18 (4): 815–817. Bibcode:1965AcCry..18..815M. doi:10.1107/S0365110X65001871.
Fowler, R. D.; Matthias, B.; Asprey, L.; Hill, H.; et al. (1965). "Superconductivity of Protactinium". Physical Review Letters. 15 (22): 860. Bibcode:1965PhRvL..15..860F. doi:10.1103/PhysRevLett.15.860.
Sellers, Philip A.; Fried, Sherman; Elson, Robert E.; Zachariasen, W. H. (1954). "The Preparation of Some Protactinium Compounds and the Metal". Journal of the American Chemical Society. 76 (23): 5935. Bibcode:1954JAChS..76.5935S. doi:10.1021/ja01652a011.
Hendricks, M. E. (1971). "Magnetic Properties of Protactinium Tetrachloride". Journal of Chemical Physics. 55 (6): 2993–2997. Bibcode:1971JChPh..55.2993H. doi:10.1063/1.1676528.
Shaaban, Tamara; Réal, Florent; Maurice, Rémi; Vallet, Valérie (2024). "Stability of the Protactinium(V) Mono-Oxo Cation Probed by First-Principle Calculations". Chemistry – A European Journal. 30 (15) e202304068. doi:10.1002/chem.202304068. ISSN 0947-6539. PMID 38240195.
Asprey, L. B.; Kruse, F. H.; Rosenzweig, A.; Penneman, R. A. (1966). "Synthesis and X-Ray Properties of Alkali Fluoride-Protactinium Pentafluoride Complexes". Inorganic Chemistry. 5 (4): 659. doi:10.1021/ic50038a034.
Di Giandomenico, M.V.; Le Naour, C. (2009). "Complex formation between protactinium(V) and sulfate ions at 10 and 60°C". Inorganica Chimica Acta. 362 (9): 3253–3258. doi:10.1016/j.ica.2009.02.033.
Eitrheim, Eric S.; Knight, Andrew W.; Schultz, Michael K.; Forbes, Tori Z.; Nelson, Andrew W. (2017). "Recent Advancements in the Radiochemistry of Elements Pertaining to Select Nuclear Materials and Wastes". ACS Symposium Series. Vol. 1263. Washington, DC: American Chemical Society. doi:10.1021/bk-2017-1263.ch009. ISBN 978-0-8412-3255-6.
Brown D.; Hall T.L.; Moseley P.T (1973). "Structural parameters and unit cell dimensions for the tetragonal actinide tetrachlorides(Th, Pa, U, and Np) and tetrabromides (Th and Pa)". Journal of the Chemical Society, Dalton Transactions (6): 686–691. doi:10.1039/DT9730000686.
Tahri, Y.; Chermette, H.; El Khatib, N.; Krupa, J.; et al. (1990). "Electronic structures of thorium and protactinium halide clusters of [ThX8]4− type". Journal of the Less Common Metals. 158: 105–116. doi:10.1016/0022-5088(90)90436-N.
Brown, D.; Petcher, T. J.; Smith, A. J. (1968). "Crystal Structures of some Protactinium Bromides". Nature. 217 (5130): 737. Bibcode:1968Natur.217..737B. doi:10.1038/217737a0. S2CID 4264482.
Dodge, R. P.; Smith, G. S.; Johnson, Q.; Elson, R. E. (1967). "The crystal structure of protactinium pentachloride". Acta Crystallographica. 22 (1): 85–89. Bibcode:1967AcCry..22...85D. doi:10.1107/S0365110X67000155.
Brown, D.; Petcher, T. J.; Smith, A. J. (1969). "The crystal structure of β-protactinium pentabromide". Acta Crystallographica B. 25 (2): 178. Bibcode:1969AcCrB..25..178B. doi:10.1107/S0567740869007357.
Brandel, V.; Dacheux, N. (2004). "Chemistry of tetravalent actinide phosphates—Part I". Journal of Solid State Chemistry. 177 (12): 4743. Bibcode:2004JSSCh.177.4743B. doi:10.1016/j.jssc.2004.08.009.
Starks, David F.; Parsons, Thomas C.; Streitwieser, Andrew; Edelstein, Norman (1974). "Bis(π-cyclooctatetraene) protactinium". Inorganic Chemistry. 13 (6): 1307. doi:10.1021/ic50136a011.
Elson, R.; Fried, Sherman; Sellers, Philip; Zachariasen, W. H. (1950). "The tetravalent and pentavalent states of protactinium". Journal of the American Chemical Society. 72 (12): 5791. Bibcode:1950JAChS..72.5791E. doi:10.1021/ja01168a547.
Iyer, P. N.; Smith, A. J. (1971). "Double oxides containing niobium, tantalum or protactinium. IV. Further systems involving alkali metals". Acta Crystallographica B. 27 (4): 731. Bibcode:1971AcCrB..27..731I. doi:10.1107/S056774087100284X.
Iyer, P. N.; Smith, A. J. (1967). "Double oxides containing niobium, tantalum, or protactinium. III. Systems involving the rare earths". Acta Crystallographica. 23 (5): 740. Bibcode:1967AcCry..23..740I. doi:10.1107/S0365110X67003639.
Grossmann, R.; Maier, H.; Szerypo, J.; Friebel, H. (2008). "Preparation of 231Pa targets". Nuclear Instruments and Methods in Physics Research A. 590 (1–3): 122. Bibcode:2008NIMPA.590..122G. doi:10.1016/j.nima.2008.02.084.
Stein, Lawrence (1964). "Protactinium Fluorides". Inorganic Chemistry. 3 (7): 995–998. doi:10.1021/ic50017a016. ISSN 0020-1669.
Dodge, R. P.; Smith, G. S.; Johnson, Q.; Elson, R. E. (1967). "The crystal structure of protactinium pentachloride". Acta Crystallographica. 22 (1): 85–89. Bibcode:1967AcCry..22...85D. doi:10.1107/S0365110X67000155. ISSN 0365-110X.
McManus, J. F.; Francois, R.; Gherardi, J.-M.; Keigwin, L. D.; et al. (2004). "Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes" (PDF). Nature. 428 (6985): 834–837. Bibcode:2004Natur.428..834M. doi:10.1038/nature02494. PMID 15103371. S2CID 205210064. Archived from the original (PDF) on 10 April 2013. Retrieved 29 November 2010.
Cheng, H.; Edwards, R.Lawrence; Murrell, M. T.; Benjamin, T. M. (1998). "Uranium-thorium-protactinium dating systematics". Geochimica et Cosmochimica Acta. 62 (21–22): 3437. Bibcode:1998GeCoA..62.3437C. doi:10.1016/S0016-7037(98)00255-5.

ed.ac.uk (Global: 1,871^st place; English: 1,234^th place)

pure.ed.ac.uk

Negre, César; et al. (2010). "Reversed flow of Atlantic deep water during the Last Glacial Maximum" (PDF). Nature. 468 (7320): 84–8. Bibcode:2010Natur.468...84N. doi:10.1038/nature09508. PMID 21048764.

ernet.in (Global: 4,058^th place; English: 2,544^th place)

iisc.ernet.in

Ganesan, S. (1999). "A Re-calculation of Criticality Property of ²³¹Pa Using New Nuclear Data" (PDF). Current Science. 77 (5): 667–677. Archived from the original (PDF) on 3 March 2016. Retrieved 21 March 2013.

gla.ac.uk (Global: 2,948^th place; English: 1,879^th place)

universitystory.gla.ac.uk

John Arnold Cranston Archived 11 March 2020 at the Wayback Machine. University of Glasgow

handle.net (Global: 102^nd place; English: 76^th place)

hdl.handle.net

Fajans, K.; Morris, D. F. C. (1973). "Discovery and Naming of the Isotopes of Element 91" (PDF). Nature. 244 (5412): 137–138. Bibcode:1973Natur.244..137F. doi:10.1038/244137a0. hdl:2027.42/62921.

harvard.edu (Global: 18^th place; English: 17^th place)

ui.adsabs.harvard.edu

Pa(II) is known in protactinium monoxide (PaO); see Sellers, Philip A.; Fried, Sherman; Elson, Robert E.; Zachariasen, W. H. (1954). "The Preparation of Some Protactinium Compounds and the Metal". Journal of the American Chemical Society. 76 (23): 5935. Bibcode:1954JAChS..76.5935S. doi:10.1021/ja01652a011.
Negre, César; et al. (2010). "Reversed flow of Atlantic deep water during the Last Glacial Maximum" (PDF). Nature. 468 (7320): 84–8. Bibcode:2010Natur.468...84N. doi:10.1038/nature09508. PMID 21048764.
Johansson, Sven (1954). "Decay of UX1, UX2, and UZ". Physical Review. 96 (4): 1075–1080. Bibcode:1954PhRv...96.1075J. doi:10.1103/PhysRev.96.1075.
Fajans, K. & Gohring, O. (1913). "Über die komplexe Natur des Ur X". Naturwissenschaften. 1 (14): 339. Bibcode:1913NW......1..339F. doi:10.1007/BF01495360. S2CID 40667401.
Fajans, K.; Morris, D. F. C. (1973). "Discovery and Naming of the Isotopes of Element 91" (PDF). Nature. 244 (5412): 137–138. Bibcode:1973Natur.244..137F. doi:10.1038/244137a0. hdl:2027.42/62921.
Graue, G.; Käding, H. (1934). "Die technische Gewinnung des Protactiniums". Angewandte Chemie. 47 (37): 650–653. Bibcode:1934AngCh..47..650G. doi:10.1002/ange.19340473706.
Grosse, A. V. (1934). "Metallic Element 91". Journal of the American Chemical Society. 56 (10): 2200–2201. Bibcode:1934JAChS..56R2200G. doi:10.1021/ja01325a508.
Myasoedov, B. F.; Kirby, H. W.; Tananaev, I. G. (2006). "Chapter 4: Protactinium". In Morss, L. R.; Edelstein, N. M.; Fuger, J. (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer. Bibcode:2011tcot.book.....M. doi:10.1007/978-94-007-0211-0. ISBN 978-1-4020-3555-5. S2CID 93796247.
Grosse, A. v.; Booth, E. T.; Dunning, J. R. (15 August 1939). "The Fission of Protactinium (Element 91)". Physical Review. 56 (4): 382. Bibcode:1939PhRv...56..382G. doi:10.1103/PhysRev.56.382. Retrieved 17 February 2023.
Tovesson, F.; Hambsch, F.-J; Oberstedt, A.; Fogelberg, B.; Ramström, E.; Oberstedt, S. (August 2002). "The Pa-233 Fission Cross Section". Journal of Nuclear Science and Technology. 39 (sup2): 210–213. Bibcode:2002JNST...39Q.210T. doi:10.1080/00223131.2002.10875076. S2CID 91866777.
Grosse, A. V.; Agruss, M. S. (1934). "The Isolation of 0.1 Gram of the Oxide of Element 91 (Protactinium)". Journal of the American Chemical Society. 56 (10): 2200. Bibcode:1934JAChS..56Q2200G. doi:10.1021/ja01325a507.
Marples, J. A. C. (1965). "On the thermal expansion of protactinium metal". Acta Crystallographica. 18 (4): 815–817. Bibcode:1965AcCry..18..815M. doi:10.1107/S0365110X65001871.
Fowler, R. D.; Matthias, B.; Asprey, L.; Hill, H.; et al. (1965). "Superconductivity of Protactinium". Physical Review Letters. 15 (22): 860. Bibcode:1965PhRvL..15..860F. doi:10.1103/PhysRevLett.15.860.
Sellers, Philip A.; Fried, Sherman; Elson, Robert E.; Zachariasen, W. H. (1954). "The Preparation of Some Protactinium Compounds and the Metal". Journal of the American Chemical Society. 76 (23): 5935. Bibcode:1954JAChS..76.5935S. doi:10.1021/ja01652a011.
Hendricks, M. E. (1971). "Magnetic Properties of Protactinium Tetrachloride". Journal of Chemical Physics. 55 (6): 2993–2997. Bibcode:1971JChPh..55.2993H. doi:10.1063/1.1676528.
Brown, D.; Petcher, T. J.; Smith, A. J. (1968). "Crystal Structures of some Protactinium Bromides". Nature. 217 (5130): 737. Bibcode:1968Natur.217..737B. doi:10.1038/217737a0. S2CID 4264482.
Dodge, R. P.; Smith, G. S.; Johnson, Q.; Elson, R. E. (1967). "The crystal structure of protactinium pentachloride". Acta Crystallographica. 22 (1): 85–89. Bibcode:1967AcCry..22...85D. doi:10.1107/S0365110X67000155.
Brown, D.; Petcher, T. J.; Smith, A. J. (1969). "The crystal structure of β-protactinium pentabromide". Acta Crystallographica B. 25 (2): 178. Bibcode:1969AcCrB..25..178B. doi:10.1107/S0567740869007357.
Brandel, V.; Dacheux, N. (2004). "Chemistry of tetravalent actinide phosphates—Part I". Journal of Solid State Chemistry. 177 (12): 4743. Bibcode:2004JSSCh.177.4743B. doi:10.1016/j.jssc.2004.08.009.
Elson, R.; Fried, Sherman; Sellers, Philip; Zachariasen, W. H. (1950). "The tetravalent and pentavalent states of protactinium". Journal of the American Chemical Society. 72 (12): 5791. Bibcode:1950JAChS..72.5791E. doi:10.1021/ja01168a547.
Iyer, P. N.; Smith, A. J. (1971). "Double oxides containing niobium, tantalum or protactinium. IV. Further systems involving alkali metals". Acta Crystallographica B. 27 (4): 731. Bibcode:1971AcCrB..27..731I. doi:10.1107/S056774087100284X.
Iyer, P. N.; Smith, A. J. (1967). "Double oxides containing niobium, tantalum, or protactinium. III. Systems involving the rare earths". Acta Crystallographica. 23 (5): 740. Bibcode:1967AcCry..23..740I. doi:10.1107/S0365110X67003639.
Grossmann, R.; Maier, H.; Szerypo, J.; Friebel, H. (2008). "Preparation of 231Pa targets". Nuclear Instruments and Methods in Physics Research A. 590 (1–3): 122. Bibcode:2008NIMPA.590..122G. doi:10.1016/j.nima.2008.02.084.
Dodge, R. P.; Smith, G. S.; Johnson, Q.; Elson, R. E. (1967). "The crystal structure of protactinium pentachloride". Acta Crystallographica. 22 (1): 85–89. Bibcode:1967AcCry..22...85D. doi:10.1107/S0365110X67000155. ISSN 0365-110X.
McManus, J. F.; Francois, R.; Gherardi, J.-M.; Keigwin, L. D.; et al. (2004). "Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes" (PDF). Nature. 428 (6985): 834–837. Bibcode:2004Natur.428..834M. doi:10.1038/nature02494. PMID 15103371. S2CID 205210064. Archived from the original (PDF) on 10 April 2013. Retrieved 29 November 2010.
Cheng, H.; Edwards, R.Lawrence; Murrell, M. T.; Benjamin, T. M. (1998). "Uranium-thorium-protactinium dating systematics". Geochimica et Cosmochimica Acta. 62 (21–22): 3437. Bibcode:1998GeCoA..62.3437C. doi:10.1016/S0016-7037(98)00255-5.

seas.harvard.edu

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Pa(II) is known in protactinium monoxide (PaO); see Sellers, Philip A.; Fried, Sherman; Elson, Robert E.; Zachariasen, W. H. (1954). "The Preparation of Some Protactinium Compounds and the Metal". Journal of the American Chemical Society. 76 (23): 5935. Bibcode:1954JAChS..76.5935S. doi:10.1021/ja01652a011.
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wiktionary.org (Global: 649^th place; English: 827^th place)

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The prefix "eka" is derived from the Sanskrit एक, meaning "one" or "first." In chemistry, it was formerly used to denote an element one period below the element name following it.

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Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (4 May 2022). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
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Protactinium (English Wikipedia)

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