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Soddy and Isotopes Rediscovery of the Elements Soddy and Isotopes III~1 Figure 2. This plaque is mounted at 11 University Gardens. The building, now known as the George James L. Marshall, Beta Eta /971, and Service House, presently houses the Humanities Virginia R. Marshall, Beta Eta 2003, Advanced Technology and Information Institute (IIATI!) of the Univcrsity ofGlasgow. Department of Chemistry University of - 9 North Texas, Denton,TX 76203-5070, tion of a known element to another known [email protected] Figure 1. The home of Sir George and Lady Beilby, element; this research was the basis of the the parents of Frederick Soddy's wife, Winifred, at future understanding of the alpha particle.' A Dinner Party in Glasgow, Scotland. During 11 University Gardens, Glasgow, Scotland. The In 1904, Soddy became Professor at the a social gathering in 1913 at the home of his in- home is of Victorian architecture and was built in University of Glasgow, where he formulated laws, Frederick Soddy (1877-1956) (Figure 1) 1884. Sir George was an industrial chemist who the concept of isotopes. After 10 years at was musing what to call a new concept. For a furnished 50 kilograms of uranyl nitrate to Soddy Glasgow, Soddy moved to the University of decade a plethora of radioelements, each with a for his experiments. This home served as a popular Aberdeen (1914-1919), where he co-discovered unique half-life, had been discovered at various meeting place for politics, science, business, and the element protactinium ("eka-tantalum"). universities throughout Europe and North leisure. In the drawing-room of this home, the World War I had a distressing effect on Soddy; America, and there was no room in the Periodic word "isotope"was coined by Soddy at the the death of Henry Moseley"' elicited the fol- Table to accommodate them. To solve this prob- suggestion of Dr. Margaret Todd. lowing from Soddy,' "When Moseley was killed lem, Soddy was proposing that radioelements at Gallipoli I felt enraged. Sometimes I think with different half-lives but with the same at that university, who was just beginning to that something snapped in my brain.... I felt chemical properties should be confined in one investigate the strange emanation from thori- that governments and politicians, or man in box in the Table. The scholarly Dr. Margaret um.; For the next two years the two colleagues general, was not yet fitted to use science." Todd (1859-1918), an M.D. and novelist friend established the elemental nature of thoron Soddy moved in 1919 to Oxford University, of his wife, Winifred, suggested' such elements (radon-220), developed the understanding of where with a new mission he tried to establish be denoted by the Greek words "same place" radioactive half-lives, and discovered the nat- economic policy based on scientific laws. He ("iso-topos") (Figure 2). Soddy shortly ural transmutation of the elements.' It was retired in 1936, after a frustrating period in his announced his idea of "isotopes" (December 4, actually Soddy the chemist, well versed in the life, with a "sense of failure.... in the field of 1913) in the prestigious journal Nature. history of alchemy, who first understood the economics." He was at Oxford when he accept- significance of transmutation, before Ruther- ed the Nobel Prize in 1921 for his research in The Life of Frederick Soddy. A native of ford the physicist.' radio-elements and isotopy at Glasgow, and for Eastbourne in East Sussex, 85 km south of In 1903, Soddy returned to England and teaching us that atoms could have "identical London, Frederick Soddy was trained at the joined the research group of William Ramsay outsides but different insides."' University of Aberystwyth (Wales) and at (1852-1916; the discoverer of the noble gases) Oxford University, graduating in 1898. After at University College, London, to study the The Discovery of the Radioelements (see three years as researcher at Oxford, Soddy decay by-products of radium. In Ramsay's lab- Figure 3). Radioactivity was discovered by accepted the position of Demonstrator at oratory, Soddy established that helium was Antoine Henri Becquerel when he observed McGill University, Montreal, Canada. After a produced during the decay of radium, thus uranium emitted invisible rays that fogged pho- year he joined the group of Ernest Rutherford furnishing the first evidence of the transmuta- tographic plates wrapped with paper or metal 68 THE HEXAGON/WINTER 2010 Figure 3 (LEFT). The decay sequences of the natural radioelements (Fajansand 238 U-238 = Klaproth's "uranium" U1 Soddy "Displacement Laws"), patterned after Soddy's original list" and 236 graph."' Atoms decay by emitting an a-particle (moving left two units and U-235 = AcU ("actinourani ") cu down four units) or a /3-particle (moving right one unit). The list of natural 234 UX1 / UX2 (Fajans' "brevium") / U2 radioelements includes some 40 members and organized into three main series: 232 Th-232 = Berzelius' "thorium" T U-238, originally identified as U1 ("radium series,"the black plot), U-235, UY / Hahn's "protactiniu ' originally identified as "actinouranium"("actiniumseries,"the red plot), and 230 ("ionium") Th-232, originally identified as merely "thorium"("thorium series,"the blue 228 MsTh1 / MsTh2 / RdTh plot). The atomic number and mass for each radioelement can be determined Debierne's "actiniu RdAc from the respective abscissa and ordinate. For each radioelement the original 226 Curie's "radium" name is given (in addition to the customary elemental abbreviations, Rd = 224 AcK (Perey's radio, Ms = meso; for example RdAc = radioactinium). (For a more complete "francium" AcX E 222 Rn ("radon") description including half-lives of the radioelements, see reference 11). U- 220 T ("thoron") E An("actinon") 0 218 216 hA 0iPlacedi S.Unier AcA 4 214 RaB / RaC / RaC' SlSOTOPE PLAQ lnivrs 212 ThB / ThC / ThC' CAve c/AcC y 210 RaD / RaE / RaF (Curie's "polonium") ~ University of Glasgow ORD KELVIN'S HOUSE 208 '/ ThD ThD = stable Pb-208 AcD = stable Pb-207 cC" / AcD May Street River Keln 206 RaG RaG = stable Pb 206 [OLD CHEMISTRY B 204 Dumjbarton Road TI Pb Bi Po At Rn Fr Ra Ac Th Pa U 81 82 83 84 85 86 87 88 89 90 91 92 200 m Atomic number MUSEUM STORES foil.' His discovery prompted the search for Ernest Rutherford attempted to reproduce Figure 4 (ABOVE). Map of Glasgow. Sites of new radioactive elements by Marie Curie, who Crookes' work, but was perplexed by his obser- interest in the University of Glasgow area: canvassed all known elements and determined vation that in his hands purified uranium was Site where Soddy proposed the concept of"isotope," that of these only uranium and thorium exhib- still radioactive. By following Crookes'procedure 11 University Gardens - N55 52.37 W04 17.45. ited activity." After noticing that ores of urani- exactly, Rutherford realized the discrepancy Joseph Black Building (modern chemistry building), um were much more radioactive than expected, was due to Crookes' using the older Becquerel University of Glasgow - N55 52.32 W04 17.57 she launched her classic research with her hus- method of radioactivity detection (fogging of Lord Kelvin's house, University of Glasgow - N55 band, Pierre Curie, to discover polonium and wrapped photograph plates) instead of the 52.28 W04" 17.43. radium in 1898, and her colleague Andr6 "electric method" which utilized an ionization Old Chemistry Building, Main Building, Gilbert Debierne discovered actinium in 1899.4 chamber pioneered by Pierre Curie' Scott Building (now geography), where Soddy The discovery of radioactive elements con- (Rutherford used the Dolezalek electrometer,7 a performed his work on isotopes - N55 52.24 refinement of this method 4'). On the basis of tinued, which became known as the "radioele- W040 17.25. ments." In 1900, William Crookes (1832-1919) his work at Cambridge where he defined a- Museum Stores, site of Soddy's equipment and - the discoverer of thallium-made an aston- and 13-rays, Rutherford realized that pure urani- models, Thurso Street - N55 52.17 W04* 17.84. ishing observation: he found that purified ura- um (and its compounds) was an a-emitter nium nitrate (prepared either by precipitation (whose rays were stopped by paper or foil) and with ammonium carbonate or by extraction that UX1 was a 1-emitter (whose rays passed The thorium and uranium series of with ether) exhibited no radioactivity at all!' through Becquerel's and Crookes' paper wrap- radioelements (see Figure 3). Rutherford and (This puzzling observation was shortly pings). Rutherford designed an ionization Soddy turned to thorium and found it exhibit- explained by Rutherford; vide infra). Instead, chamber in which he could readily distinguish ed similar behavior. Reacting thorium nitrate radioactivity resided in the separated residue, a-rays and 1-rays by alternatively using shields with ammonia (to precipitate thorium hydrox- which Crookes named uranium X, or Ur-X of 0.1 mm aluminum foil (impervious to a-rays) ide) gave a filtrate, which when concentrated (later named UX1). If Crookes had followed up or 5 mm aluminum foil (impervious to P-rays).' gave a very active residue they called thorium- this work, he would have been the discoverer of (The third type of emission, y-emission was X (ThX). Careful study showed ThX in turn the natural transmutation of elements, because recently discovered by Paul Villard in 1900, transmuted into emanation (thoron), which UX1 was actually thorium-234, produced by the could be inferred by its stoppage using by 50 cm itself changed to an entire sequence of new a-decay of uranium-238. of aluminum.) After a period of time, an undis- radioactive products!' After the Christmas hol- turbed sample of purified uranium nitrate pro- idays of 1901, Rutherford and Soddy returned The explanation of UX1 by Rutherford.
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