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6. Glenn Seaborg: Venturing Beyond Uranium

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6. Glenn Seaborg: Venturing Beyond Uranium MYSTERY OF MATTER: SEARCH FOR THE ELEMENTS 6. Glenn Seaborg: Venturing Beyond Uranium CHAPTER 1: The Germans Split the Uranium Atom Alignment with the NRC’s National Science Education Standards B: Physical Science Structure of Atoms The nuclear forces that hold the nucleus of an atom together, at nuclear distances, are usually stronger than the electric forces that would make it fly apart. Nuclear reactions convert a fraction of the mass of interacting particles into energy, and they can release much greater amounts of energy than atomic interactions. Fission is the splitting of a large nucleus into smaller pieces. F: Science and Technology in Local, National, and Global Challenges Understanding basic concepts and principles of science and technology should precede active debate about the economics, policies, politics, and ethics of various science- and technology-related challenges. However, understanding science alone will not resolve local, national, or global challenges. Alignment with the Next Generation Science Standards Science and Engineering Practices 8. Obtaining, Evaluating, and Communicating Information Gather, read, and evaluate scientific and/or technical information from multiple authoritative sources, assessing the evidence and usefulness of each source. Disciplinary Core Ideas Nuclear processes, including fusion, fission, and radioactive decays of unstable nuclei, involve release or absorption of energy. The total number of neutrons plus protons does not change in any nuclear process. On a panel in the host scene, the Periodic Table fills in with all the elements Moseley predicted. CONCEPT IN BRIEF: element HOST In the decades after Harry Moseley’s death, chemists found all the missing elements he had left room for. By 1945, every space was filled, from the lightest element, hydrogen, to the heaviest, uranium. The Periodic Table was complete. Except it wasn’t. By this time, the next generation of element hunters had already begun a whole new chapter. They had figured how to create new elements – elements that didn’t exist anywhere on earth. 1 MYSTERY OF MATTER: SEARCH FOR THE ELEMENTS Host steps forward to reveal photo of young Glenn Seaborg on a panel. CONCEPT IN BRIEF: fission HOST EXAMPLE OF SCIENCE PRACTICE: obtaining, The central character in these events was a young American chemist named Glenn evaluating, and communicating information Seaborg. He set out with a simple desire to make one of these new elements. Host steps forward again. A mushroom cloud appears on a second panel. HOST But he would end up changing the world forever, unleashing a force of unimaginable destructive power. Cut to barbershop scene: A young man leafs through the January 31, 1939, issue of the San Francisco Chronicle while getting his hair cut. NARR: The story begins in late January 1939, when a young physicist in Berkeley, California, learned of a startling discovery in an unusual way. ERIC SEABORG, partly in VO One of my father’s colleagues, Luis Alvarez, was sitting in the barber shop getting his hair cut when he read about this in the paper. Alvarez leaps from the chair, rips off the barber's bib and runs out of the shop. PHYSICIST LUIS ALVAREZ, partly in VO Buried on an inside page of the San Francisco Chronicle was a story from Washington. German chemists had split the uranium atom by bombarding it with neutrons. I stopped the barber, mid-snip, and ran all the way to the Radiation Laboratory to spread the word. Photo of the Rad Lab exterior LUIS ALVAREZ VO The first person I saw was my graduate student, Phil Abelson. Abelson sits at the control panel of the cyclotron. We hear the sound of running footsteps. 2 MYSTERY OF MATTER: SEARCH FOR THE ELEMENTS PHIL ABELSON, partly in VO I was at the control console operating the cyclotron. About 9:30 a.m., I heard the sound of running footsteps outside. Alvarez bursts into the cyclotron room and blurts out the news. LUIS ALVAREZ Phil, the Germans have split the uranium atom! Hahn and Strassman have done it. Uranium split in two! PHIL ABELSON When I heard what he had read, I was stunned. STOP AND THINK 1: What was significant about the news that chemists had split the atom? Possible Student Answers: Students may know that this was the first time that people had caused a change to the nucleus of an atom, which is called a nuclear reaction. EVERYDAY APPLICATION 1: Splitting the uranium atom led to the atomic bomb, nuclear power plants, and radioactive isotopes used for medical and safety applications. Photo of Sather Gate at UC Berkeley in the 1930s NARR: Word spread quickly across the University of California campus. Photo of young Glenn Seaborg at Sather Gate NARR: One of the first to hear the news was Glenn Seaborg, then a 26-year-old chemistry instructor. ERIC SEABORG He was just stunned, and he spent hours walking the streets of Berkeley thinking about it. GLENN SEABORG I was exhilarated at the discovery, but at the same time I felt stupid for having overlooked this possibility. I’d missed the chance for an astounding discovery. 3 MYSTERY OF MATTER: SEARCH FOR THE ELEMENTS CHAPTER 2: A Nobel Prize-Winning Mistake Alignment with the NRC’s National Science Education Standards B: Physical Science Structure of Atoms Matter is made of minute particles called atoms, and atoms are composed of even smaller components. These components have measurable properties, such as mass and electrical charge. Each atom has a positively charged nucleus surrounded by negatively charged electrons. The electric force between the nucleus and electrons holds the atom together. The atom's nucleus is composed of protons and neutrons, which are much more massive than electrons. When an element has atoms that differ in the number of neutrons, these atoms are called different isotopes of the element. The nuclear forces that hold the nucleus of an atom together, at nuclear distances, are usually stronger than the electric forces that would make it fly apart. Nuclear reactions convert a fraction of the mass of interacting particles into energy, and they can release much greater amounts of energy than atomic interactions. Fission is the splitting of a large nucleus into smaller pieces. G: History and Nature of Science Science as a Human Endeavor Individuals and teams have contributed and will continue to contribute to the scientific enterprise. Doing science or engineering can be as simple as an individual conducting field studies or as complex as hundreds of people working on a major scientific question or technological problem. Pursuing science as a career or as a hobby can be both fascinating and intellectually rewarding. Nature of Scientific Knowledge Because all scientific ideas depend on experimental and observational confirmation, all scientific knowledge is, in principle, subject to change as new evidence becomes available. … In situations where information is still fragmentary, it is normal for scientific ideas to be incomplete, but this is also where the opportunity for making advances may be greatest. Historical Perspectives Usually, changes in science occur as small modifications in extant knowledge. The daily work of science and engineering results in incremental advances in our understanding of the world and our ability to meet human needs and aspirations. Much can be learned about the internal workings of science and the nature of science from study of individual scientists, their daily work, and their efforts to advance scientific knowledge in their area of study. Alignment with the Next Generation Science Standards Science and Engineering Practices 1. Asking Questions and Defining Problems Ask questions to clarify and refine a model, an explanation, or an engineering problem. 4 MYSTERY OF MATTER: SEARCH FOR THE ELEMENTS 2. Developing and Using Models Develop, revise, and/or use a model based on evidence to illustrate and/or predict the relationships between systems or between components of a system. 3. Planning and Carrying Out Investigations Plan and conduct an investigation individually and collaboratively to produce data to serve as the basis for evidence, and in the design: decide on types, how much, and accuracy of data needed to produce reliable measurements and consider limitations on the precision of the data (e.g., number of trials, cost, risk, time), and refine the design accordingly. Select appropriate tools to collect, record, analyze, and evaluate data. 4. Analyzing and Interpreting Data Evaluate the impact of new data on a working explanation and/or model of a proposed process or system. Constructing Explanations and Designing Solutions Apply scientific ideas, principles, and/or evidence to provide an explanation of phenomena. 8. Obtaining, Evaluating, and Communicating Information Construct, use, and/or present an oral and written argument or counter-arguments based on data and evidence. Disciplinary Core Ideas Attraction and repulsion between electric charges at the atomic scale explain the structure, properties, and transformations of matter, as well as the contact forces between material objects. Each atom has a charged substructure consisting of a nucleus, which is made of protons and neutrons, surrounded by electrons. Nuclear processes, including fusion, fission, and radioactive decays of unstable nuclei, involve release or absorption of energy. The total number of neutrons plus protons does not change in any nuclear process. Crosscutting Concepts In nuclear processes, atoms are not conserved, but the total number of protons plus neutrons is conserved. Host enters studio. Suspended in mid-air to his left is an animation of the atom showing only red CONCEPT IN BRIEF: atom protons in the nucleus. HOST Many other had missed it too. In fact, the splitting of the atom – nuclear fission – was so unexpected that it forced scientists to rethink what they knew about the atom. Camera pulls back to reveal a panel on which there is a photo of Rutherford’s lab group.
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