{"id":2578,"date":"2019-01-29T15:53:28","date_gmt":"2019-01-29T06:53:28","guid":{"rendered":"http:\/\/163.180.4.222\/lab\/?p=2578"},"modified":"2019-10-16T11:49:05","modified_gmt":"2019-10-16T02:49:05","slug":"the-first-synthetic-element","status":"publish","type":"post","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=2578","title":{"rendered":"The first synthetic element"},"content":{"rendered":"

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When Mendeleev proposed his periodic table in 1869, element 43 was unknown. In 1937, it became the first element to be discovered by synthesis in a laboratory \u2014 paving the way to the atomic age.<\/h5>\n

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Figure 1 | Mendeleev\u2019s periodic table.<\/b>\u00a0When Mendeleev devised his periodic table 150 years ago, he left spaces for elements that he thought were missing. The gap indicated by the dashed box is for element 43. Carlo Perrier and Emilio Segr\u00e83<\/a><\/sup>\u00a0discovered this element, now known as technetium, in 1937. Credit: Science History Institute<\/p>\n<\/figcaption><\/figure>\n<\/div>\n

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In 1937, a piece of molybdenum plate arrived at the University of Palermo in Sicily. It had been shipped from the University of California, Berkeley, where it had been part of Ernest Lawrence\u2019s \u2018atom smasher\u2019 \u2014 one of the first particle accelerators, known as the 37-inch cyclotron. The plate contained the most important missing piece of the chemical world.<\/p>\n

Element 43 \u2014 provisionally named \u2018eka-manganese\u2019 before its discovery \u2014 was a hole in the periodic table set out by Dmitri Mendeleev in 1869. Although there had been earlier attempts to order the chemical elements, Mendeleev arranged his table according to the atomic mass and properties of elements, and left gaps where he felt particular ones were missing (Fig. 1). Most of the spaces were gradually filled, validating Mendeleev\u2019s ideas. By the 1930s, the most notable of the still-absent building blocks was eka-manganese. Researchers had long sought this elusive element, but each of the claims had been proved wrong. Now, in Palermo, it was Italian physicist Emilio Segr\u00e8\u2019s turn to try.<\/p>\n

Aged only 32, Segr\u00e8 already had a reputation for element discovery. A Sephardic Jew and son of a paper-mill owner from Tivoli, Segr\u00e8 had trained as a physicist under Enrico Fermi before leaving to become an anti-aircraft officer in the Italian army. By 1929, he had rejoined Fermi as one of his \u2018Via Panisperna Boys\u2019, a group of impoverished scientists with a shoestring budget and no modern equipment; the scientists\u2019 younger brothers were recruited to lift apparatus, tools were made by hand and the researchers had to hide at the end of the corridor to shield themselves from radiation1<\/a><\/sup>. Yet despite their hardships, in 1934, Fermi\u2019s team had extended the limits of Mendeleev\u2019s table.<\/p>\n

In France, Fr\u00e9d\u00e9ric and Ir\u00e8ne Joliot-Curie had shown that one element could be turned into another using artificially induced radiation. Fermi, Segr\u00e8 and the rest of the Boys took the idea one step further by bombarding a sample of uranium \u2014 element 92, the heaviest known element at that time \u2014 with an improvised neutron beam. In doing so, Fermi seemed2<\/a><\/sup>\u00a0to have synthesized elements 93 and 94.<\/p>\n

Segr\u00e8 hoped that Lawrence had unknowingly created another element as a result of using molybdenum in his cyclotron. Molybdenum is element 42; if heavy hydrogen isotopes (deuterons) had accelerated through Lawrence\u2019s cyclotron and irradiated a molybdenum plate, it could contain a few specks of eka-manganese. Segr\u00e8 asked Lawrence to send him any spare parts that had become radioactive. Lawrence, having no use for the discarded metal, happily obliged.<\/p>\n

Enlisting the help of his colleague Carlo Perrier, Segr\u00e8 carried out a chemical analysis of the plate, extracting an unknown element by boiling a sample with sodium hydroxide and hydrogen peroxide3<\/a><\/sup>,<\/sup>4<\/a><\/sup>. It was the first sighting of element 43. With it, the mystery of why this element hadn\u2019t been found was solved: eka-manganese was unstable, with a radioactive half-life of a few million years. Any sample that existed naturally when Earth formed would have decayed aeons ago.<\/p>\n

The story of the new element was only just beginning. In June 1938, Segr\u00e8 headed to Berkeley to continue his research. While he was en route, Mussolini\u2019s fascist government passed laws barring Jewish people from holding university positions in Italy. Segr\u00e8, trapped in California, sent for his family and took up permanent residence. There, he worked with a young chemist, Glenn Seaborg, to isolate an unusual, metastable isotope of his new element5<\/a><\/sup>.<\/p>\n

Two pieces of news arrived soon after. In November, Fermi won the Nobel prize for his discovery of elements beyond uranium. Fermi, whose wife was Jewish, used the prize as a pretext by which to escape Italy, too. Then, two months later, word came from Germany that Fermi\u2019s \u2018elements\u2019 were a mistake: a group led by Otto Hahn and Lise Meitner had shown that Fermi\u2019s discoveries were the result of an atom breaking apart, and were probably barium, krypton and fragments of other elements6<\/a><\/sup>. This revelation would eventually lead to the development of nuclear weapons \u2014 and meant that Segr\u00e8 and Perrier\u2019s eka-manganese was the first true synthetic element. In 1947, ten years after its discovery, they named it technetium, after \u2018technetos\u2019, the Greek word for \u2018artificial\u20197<\/a><\/sup>. By then, all the other empty spaces in Mendeleev\u2019s table had been filled, with Segr\u00e8 also contributing to the creation of element 85, astatine.<\/p>\n

The lab-created elements opened up a search for elements heavier than uranium (transuranium elements). In 1939, Berkeley researcher Edwin McMillan approached Segr\u00e8 about an unusual atom that he\u2019d discovered in the cyclotron, which he believed to be a new element. Segr\u00e8 dismissed the finding, even going so far as to write a paper8<\/a><\/sup>: \u2018An unsuccessful search for transuranic elements\u2019. In fact, McMillan had discovered element 93, which he called neptunium. Then, in February 1941, taking over McMillan\u2019s work, Seaborg discovered element 94. With Segr\u00e8\u2019s help, Seaborg soon proved that his creation \u2014 plutonium \u2014 could be used in an atomic bomb. It was the first of ten synthetic elements that he would go on to discover; another, seaborgium (element 106), was named in his honour.<\/p>\n

Technetium proved that the exploration of the periodic table was not limited to the elements found on Earth. Today, we have extended the table as far as the superheavy element 118, oganesson. With the new elements have come applications few could have imagined: smoke detectors, power for space probes and the most devastating weapons known. But arguably the greatest discovery remains technetium, and the metastable isotope of the element that Segr\u00e8 discovered with Seaborg. With its short, six-hour half-life, it is an ideal radioactive tracer. Today, technetium is the most commonly used medical radioisotope in the world (go.nature.com\/2t4iqq8<\/a>), accounting for 80% of procedures in nuclear medicine, and helping to save millions of lives every year. Not bad for something first seen in a discarded piece of metal plate.<\/p>\n

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Nature<\/span>\u00a0565<\/strong>, 570-571 (2019)<\/p>\n

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doi: 10.1038\/d41586-019-00236-4<\/div>\n<\/div>\n

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(\uc6d0\ubb38: \uc5ec\uae30<\/a>\ub97c \ud074\ub9ad\ud558\uc138\uc694~)<\/p>\n

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\uc774\ud0c8\ub9ac\uc544\uacc4 \ubbf8\uad6d\uc778 \ubb3c\ub9ac\ud559\uc790 \uc5d4\ub9ac\ucf54 \ud398\ub974\ubbf8\ub294 1934\ub144 92\ubc88 \uc6d0\uc18c \uc6b0\ub77c\ub284(U)\uc5d0 \uc911\uc131\uc790\ub97c \ucda9\ub3cc\uc2dc\ucf1c 93\ubc88 \ub135\ud22c\ub284(Np<\/span>)\uacfc 94\ubc88 \ud50c\ub8e8\ud1a0\ub284(Pu<\/span>) \uc6d0\uc18c\ub97c \uc5bb\uc5c8\ub2e4\uace0 \ud559\uacc4\uc5d0 \ubcf4\uace0\ud588\ub2e4. \uc774\ub54c \uc774\ub2e4 \ub178\ub2e4\ud06c\ub294 \ub354 \uac00\ubcbc\uc6b4 \uc6d0\uc18c\ub3c4 \ub098\uc62c \uac83\uc774\ub77c\uace0 \ub3c5\uc77c \ud654\ud559\ud559\uc220\uc9c0 \u2018\uc559\uac8c\ubc18\ud14c \ucf00\ubbf8\u2019\uc5d0 \uc18c\uac1c\ud588\ub2e4. 1938\ub144 \ub9c8\uc774\ud2b8\ub108\uc640 \ud55c\uc774 \ud398\ub974\ubbf8\uc758 \uc2e4\ud5d8\uc5d0\uc11c 56\ubc88 \uc6d0\uc18c \ubc14\ub968(Ba<\/span>)\uc774 \ubc1c\uacac\ub418\ub294 \uac83\uc744 \ud655\uc778\ud558\uba70 \ub178\ub2e4\ud06c\uc758 \ud575\ubd84\uc5f4 \uac1c\ub150\uc774 \uc785\uc99d\ub410\ub2e4. \ud55c\uc740 \ub9ac\uc81c \ub9c8\uc774\ud2b8\ub108\uc758 \uacc4\uc0b0\uc774 \uc6d0\uc790 \ud575\ubd84\uc5f4\uc758 \uc911\uc694\ud55c \uc99d\uac70\uac00 \ub418\uc5c8\uc74c\uc5d0\ub3c4 1939\ub144 \uc774\ub97c \ubc1c\ud45c\ud55c \ub17c\ubb38\uc5d0 \ub9c8\uc774\ud2b8\ub108\uc758 \uc774\ub984\uc744 \ub123\uc9c0 \uc54a\uc558\uace0 1944\ub144 \ub178\ubca8 \ud654\ud559\uc0c1\uc744 \ubc1b\uc744 \ub54c\uc5d0\ub3c4 \ub9c8\uc774\ud2b8\ub108\uc758 \uc5c5\uc801\uc744 \ubc1d\ud788\uc9c0 \uc54a\uc558\ub2e4.<\/p>\n

\"\"<\/span><\/p>\n

\ud504\ub791\uc2a4 \ubb3c\ub9ac\ud559\uc790 \ub9c8\ub974\uac8c\ub9ac\ud2b8 \ud398\ub808(\uc67c\ucabd)\ub294 19\uc138 \ub54c 87\ubc88 \uc6d0\uc18c \ud504\ub791\uc298(Fr<\/span>)\uc744 \ubc1c\uacac\ud588\ub2e4. \ud034\ub9ac \ubc15\ubb3c\uad00 \uc81c\uacf5<\/em><\/span><\/p>\n

 <\/p>\n

\ub300\ubd80\ubd84 \uc5ec\uc131 \uacfc\ud559\uc790\ub4e4\uc774 \ub0a8\uc131 \ub3d9\ub8cc\uc640 \ud568\uaed8 \uc77c\ud558\uba74\uc11c \uc790\uc2e0\ub4e4\uc758 \uc5c5\uc801\uc774 \uac00\ub824\uc9c0\ub294 \ucc98\uc9c0\uc5d0 \ub193\uc600\uc9c0\ub9cc, \uc608\uc678\ub3c4 \uc788\ub2e4. \ud504\ub791\uc2a4 \ubb3c\ub9ac\ud559\uc790 \ub9c8\ub974\uac8c\ub9ac\ud2b8 \ud398\ub808\ub2e4. \ud398\ub808\ub294 87\ubc88 \uc6d0\uc18c \ud504\ub791\uc298(Fr<\/span>)\uc744 1939\ub144\uc5d0 \ubc1c\uacac\ud588\ub2e4. \ub9c8\ub9ac \ud034\ub9ac \uc5f0\uad6c\uc18c\uc5d0 19\uc138 \ub54c \uae30\uc220\uc790\ub85c \ub4e4\uc5b4\uac00 \uc5bb\uc740 \uc131\uacfc\ub2e4. \ub9c8\ub9ac \ud034\ub9ac\uc758 \ub538 \uc774\ub80c \uc878\ub9ac\uc5e3\ud034\ub9ac\uc640 \uc559\ub4dc\ub808 \ub4dc\ube44\uc5d0\ub978\uc774 \uadf8\ub140\uc5d0\uac8c \ub3d9\uc2dc\uc5d0 \uc545\ud2f0\ub284-227 \ub3d9\uc704\uc6d0\uc18c\uc758 \uc815\ud655\ud55c \ubc18\uac10\uae30\ub97c \uce21\uc815\ud574\ub2ec\ub77c\uace0 \ud558\ub294 \uacfc\uc815\uc5d0\uc11c \ud504\ub791\uc298\uc774 \ubc1c\uacac\ub410\ub2e4. \ud558\uc9c0\ub9cc \ud398\ub808\uac00 \ub204\uad6c\ub97c \uc704\ud574 \uc77c\ud558\uace0 \uc788\ub294\uc9c0 \uc815\ud560\uc218 \uc5c6\uc5c8\uae30\uc5d0 \ub450 \uc0ac\ub78c\uc740 \ubc1c\uacac\uc5d0 \ub300\ud574 \uc790\uc2e0\uc758 \uc5ed\ud560\uc744 \uc8fc\uc7a5\ud560 \uc218 \uc5c6\uc5c8\ub2e4. \ud398\ub808\ub294 1962\ub144 \ud504\ub791\uc2a4 \uacfc\ud559\uc6d0\uc5d0 \uc5ec\uc131 \ucd5c\ucd08\ub85c \uad50\uc2e0 \ud68c\uc6d0\uc73c\ub85c \ubf51\ud614\ub2e4.<\/p>\n

 <\/p>\n

 <\/p>\n

(\uc6d0\ubb38: \uc5ec\uae30<\/a>\ub97c \ud074\ub9ad\ud558\uc138\uc694~)<\/p>\n

 <\/p>\n

 <\/p>\n

<\/h5>\n","protected":false},"excerpt":{"rendered":"

    When Mendeleev proposed his periodic table in 1869, element 43 was unknown. In 1937, it became the first element to be discovered by(more…)<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[41,38,32,34,29,47],"tags":[],"class_list":["post-2578","post","type-post","status-publish","format-standard","hentry","category-05---","category-38","category-essays-on-science","category-lets-do-chemistry","category-lets-do-science","category-47"],"aioseo_notices":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack-related-posts":[{"id":2702,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=2702","url_meta":{"origin":2578,"position":0},"title":"Mendelevium 101","author":"biochemistry","date":"February 22, 2019","format":false,"excerpt":"\u00a0 \u00a0 The first element to be identified one atom at a time was named after the main architect of the modern periodic table. This seemingly straightforward etymological choice illustrates how scientific recognition can eclipse geopolitical tensions, says Anne Pichon. \u00a0 \u00a0 Statue of Dmitri Mendeleev in St Petersburg.\u00a0Credit: Anton\u2026","rel":"","context":"In "Essays on Science"","block_context":{"text":"Essays on Science","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?cat=32"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3259,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=3259","url_meta":{"origin":2578,"position":1},"title":"Turning the periodic table upside down","author":"biochemistry","date":"April 9, 2019","format":false,"excerpt":"\u00a0 The periodic table is immensely powerful for rationalizing many different properties of the chemical elements, but would turning it on its head make some important aspects easier to understand and give everyone a new perspective on chemistry? \u00a0 It is 150 years since Dmitri Ivanovich Mendeleev first put forward\u2026","rel":"","context":"In "Essays on Science"","block_context":{"text":"Essays on Science","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?cat=32"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":894,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=894","url_meta":{"origin":2578,"position":2},"title":"The battle behind the periodic table\u2019s latest additions","author":"biochemistry","date":"June 15, 2018","format":false,"excerpt":"\u00a0 \u00a0 (\uc6d0\ubb38) \u00a0 \u00a0 Four new elements were added in 2015 with great fanfare \u2014 but some researchers complain the announcement was premature. \u00a0 \u00a0 \u00a0 Illustration by Karol Banach The mood at B\u00e4ckaskog Castle in southern Sweden should have been upbeat when chemists and physicists gathered there for\u2026","rel":"","context":"In "Let's Do Chemistry!"","block_context":{"text":"Let's Do Chemistry!","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?cat=34"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4157,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=4157","url_meta":{"origin":2578,"position":3},"title":"Discovery is always political","author":"biochemistry","date":"September 27, 2019","format":false,"excerpt":"\u00a0 \u00a0 David Kaiser traces the roots of government support for science, in the first of a series of essays on how the past 150 years have shaped the research system, marking\u00a0Nature\u2019s 150th anniversary. \u00a0 \u00a0 Illustration by Se\u00f1or Salme \u00a0PDF version \u00a0 \u00a0 Late in August 1609, the Italian\u2026","rel":"","context":"In "Essays on Science"","block_context":{"text":"Essays on Science","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?cat=32"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3794,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=3794","url_meta":{"origin":2578,"position":4},"title":"\uba58\ub378\ub808\uc608\ud504 ‘\uc8fc\uae30\uc728\ud45c’ 150\uc8fc\ub144\u2026’\ud654\ud559’\uc774 \uac00\uc838\uc628 \uc138\uc0c1\uc758 \ubcc0\ud654","author":"biochemistry","date":"June 17, 2019","format":false,"excerpt":"\u00a0 \u00a0 \u00a0 \u00a0 2019\ub144\uc740 \uc8fc\uae30\uc728\ud45c\uac00 \ub9cc\ub4e4\uc5b4\uc9c4 \uc9c0 150\ub144\uc774 \ub418\ub294 \ud574\uc774\ub2e4. \uc6d0\uc18c\ub4e4\uc744 \uc6d0\uc790\ubc88\ud638 \uc21c\uc11c\ub300\ub85c \uc5f4\uac70\ud558\uba74\uc11c \ubc18\ubcf5\ub418\ub294 \uc8fc\uae30\uc801 \ud654\ud559 \uc131\uc9c8\uc5d0 \ub530\ub77c \ubc30\uc5f4\ud55c \uc8fc\uae30\uc728\ud45c\ub294 \ub7ec\uc2dc\uc544 \ud654\ud559\uc790 \ub4dc\ubbf8\ud2b8\ub9ac \uba58\ub378\ub808\uc608\ud504(Dmitri\u00a0Mendeleev)\uac00 \uc9c0\ub09c 1869\ub144 \ucc98\uc74c \ub9cc\ub4e4\uc5c8\ub2e4. \ub2f9\uc2dc \uc8fc\uae30\uc728\ud45c\ub294 \ud604\ub300 \uc8fc\uae30\uc728\ud45c\uc640\ub294 \ub2e4\ub978 \ud145 \ube48 \ud45c\uc600\ub2e4. \uc774\ud6c4 \uacfc\ud559\uc790\ub4e4\uc740 \ud55c\uc790\ub9ac \ud55c\uc790\ub9ac \uc8fc\uae30\uc728\ud45c \uc790\ub9ac\ub97c \ucc44\uc6cc \ub123\uc5c8\uace0 \ud604\uc7ac \uc8fc\uae30\uc728\ud45c\uc5d0\ub294 118\uac1c \uc6d0\uc18c\uac00\u2026","rel":"","context":"In "'05. \ubb3c\uc9c8\uc758 \uc9c4\ud654' \uad00\ub828"","block_context":{"text":"'05. \ubb3c\uc9c8\uc758 \uc9c4\ud654' \uad00\ub828","link":"https:\/\/biochemistry.khu.ac.kr\/lab\/?cat=41"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/img.youtube.com\/vi\/Q9OULHQpAng\/0.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":4792,"url":"https:\/\/biochemistry.khu.ac.kr\/lab\/?p=4792","url_meta":{"origin":2578,"position":5},"title":"NGC \ucf54\uc2a4\ubaa8\uc2a4 13\ubd80\uc791 (\ub3d9\uc601\uc0c1) (\uad50\uc721\uc6a9)","author":"biochemistry","date":"May 30, 2018","format":false,"excerpt":"\u00a0 \u00a0 NGC \ucf54\uc2a4\ubaa8\uc2a4 13\ubd80\uc791 \uc911 1\ubd80 : \ud504\ub85c\ub85c\uadf8 - 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