Who is this Danish physicist who made contributions to understanding atomic structure and quantum theory after whom a synthetic radioactive element with a half-life of about a minute is named?
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Bohrium Bohrium is a chemical element with symbol Bh and atomic number 107. It is named after Danish physicist Niels Bohr. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, Bh, has a half-life of approximately 61 seconds, though the unconfirmed Bh may have a longer half-life of about 690 seconds.
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Niels Bohr Niels Henrik David Bohr (] ; 7 October 1885 – 18 November 1962) was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research.
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Isotopes of lithium Naturally occurring lithium (Li) is composed of two stable isotopes, lithium-6 and lithium-7, with the latter being far more abundant: about 92.5 percent of the atoms. Both of the natural isotopes have an unexpectedly low nuclear binding energy per nucleon (~5.3 MeV) when compared with the adjacent lighter and heavier elements, helium (~7.1 MeV) and beryllium (~6.5 MeV). The longest-lived radioisotope of lithium is lithium-8, which has a half-life of just 838 milliseconds. Lithium-9 has a half-life of 178 milliseconds, and lithium-11 has a half-life of about 1.1 milliseconds. All of the remaining isotopes of lithium have half-lives that are shorter than 10 nanoseconds. The shortest-lived known isotope of lithium is lithium-4, which decays by proton emission with a half-life of about seconds, although the half-life of lithium-3 is yet to be determined, and is likely to be much shorter, like helium-2 (diproton) which undergoes proton decay within s.
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Irène Joliot-Curie Irène Joliot-Curie (] ; 12 September 1897 – 17 March 1956) was a French scientist, the daughter of Marie Curie and Pierre Curie and the wife of Frédéric Joliot-Curie. Jointly with her husband, Joliot-Curie was awarded the Nobel Prize for Chemistry in 1935 for their discovery of artificial radioactivity. This made the Curies the family with the most Nobel laureates to date. Both children of the Joliot-Curies, Hélène and Pierre, are also esteemed scientists.
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Uranium-232 Uranium-232 ( U , U , U-232) is an isotope of uranium. It has a half-life of 68.9 years and is a side product in the thorium cycle. It has been cited as an obstacle to nuclear proliferation using U as the fissile material, because the intense gamma radiation emitted by Tl (a daughter of U, produced relatively quickly) makes the U contaminated with it more difficult to handle.
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Klaus von Klitzing Klaus von Klitzing (born 28 June 1943, Schroda) is a German physicist, known for discovery of the integer quantum Hall effect, for which he was awarded the 1985 Nobel Prize in Physics.
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Harald Friedrich Harald Friedrich (19 May 1947 – 29 January 2017) was a German physicist specializing in theoretical atomic physics.
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Fermium Fermium is a synthetic element with symbol Fm and atomic number 100. It is a member of the actinide series. It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities, although pure fermium metal has not yet been prepared. A total of 19 isotopes are known, with Fm being the longest-lived with a half-life of 100.5 days.
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Hans Peter Jørgen Julius Thomsen Hans Peter Jørgen Julius Thomsen (16 February 1826 – 13 February 1909) was a Danish chemist noted in thermochemistry for the Thomsen–Berthelot principle.
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Mendelevium Mendelevium is a synthetic element with chemical symbol Md (formerly Mv) and atomic number 101. A metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities through neutron bombardment of lighter elements. It is the third-to-last actinide and the ninth transuranic element. It can only be produced in particle accelerators by bombarding lighter elements with charged particles. A total of sixteen mendelevium isotopes are known, the most stable being Md with a half-life of 51 days; nevertheless, the shorter-lived Md (half-life 1.17 hours) is most commonly used in chemistry because it can be produced on a larger scale.
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Strontium-89 Strontium-89 ( Sr ) is a radioactive isotope of strontium produced by nuclear fission, with a half-life of 50.57 days. It undergoes β decay into yttrium-89. Strontium-89 has an application in medicine.
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John Arnold Cranston Dr John Arnold Cranston FRSE FRIC LLD (15 August 1891 – 25 April 1972) was a Scottish research chemist. He is credited with the development of isotopes and also the co-discovery of Protactinium (element 91). However this credit was claimed by others, not himself directly, and only caused controversy in the scientific world after the publishing of his obituary.
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Rydberg formula The Rydberg formula is used in atomic physics to describe the wavelengths of spectral lines of many chemical elements. It was formulated by the Swedish physicist Johannes Rydberg, and presented on 5 November 1888.
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George Gamow George Gamow (March 4 [O.S. February 20] 1904 August 19, 1968), born Georgiy Antonovich Gamov (Russian: Гео́ргий Анто́нович Га́мов ; ] ), was a theoretical physicist and cosmologist. He was an early advocate and developer of Lemaître's Big Bang theory. He discovered a theoretical explanation of alpha decay via quantum tunneling, and worked on radioactive decay of the atomic nucleus, star formation, stellar nucleosynthesis and Big Bang nucleosynthesis (which he collectively called nucleocosmogenesis), and molecular genetics.
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Jörgen Lehmann Jörgen Erik Lehmann (15 January 1898 – 26 December 1989) was a Danish-born Swedish physician and chemist best known for his discovery in the 1940s that para-amino salicylic acid (PAS) would make an excellent orally-available tuberculosis therapy. PAS was, together with streptomycin, the first efficacious anti-microbial therapy for tuberculosis and remained in clinical use for several decades. In 1941, Lehmann also developed the anti-coagulant dicumarol, which is used for the prevention of blood clots and in the treatment of deep venous thrombosis.
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S. P. L. Sørensen Søren Peder Lauritz Sørensen (9 January 1868 – 12 February 1939) was a Danish chemist, famous for the introduction of the concept of pH, a scale for measuring acidity and alkalinity. He was born in Havrebjerg, Denmark.
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Flerovium Flerovium is a superheavy artificial chemical element with symbol Fl and atomic number 114. It is an extremely radioactive synthetic element. The element is named after the Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research in Dubna, Russia, where the element was discovered in 1998. The name of the laboratory, in turn, honours the Russian physicist Georgy Flyorov (Флёров in Cyrillic, hence the transliteration of "yo" to "e"). The name was adopted by IUPAC on 30 May 2012.
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Manne Siegbahn Karl Manne Georg Siegbahn {'1': ", '2': ", '3': 'ForMemRS', '4': "} (3 December 1886 – 26 September 1978) was a Swedish physicist who was awarded the Nobel Prize in Physics in 1924 "for his discoveries and research in the field of X-ray spectroscopy".
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Natural isotopes Natural isotopes are either stable isotopes, radioactive isotopes that have a sufficiently long half-life to allow them to exist in substantial concentrations in the Earth (e.g. bismuth-209, with a half-life of 1.9 * 10 years, potassium-40 with a half-life of 1.251(3)×10 y), daughter products of those isotopes (e.g. Th, with a half-life of 24 days) or cosmogenic elements. The heaviest stable isotope is lead-208, but the heaviest 'natural' isotope is U-238.
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Gerhard Kraft Gerhard Kraft (born 1941 in Heidelberg, Germany) is a German physicist, best known for introducing heavy ion cancer therapy in Europe.
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Heinz-Jürgen Kluge Heinz-Jürgen Kluge, known as Jürgen Kluge (born 25 April 1941), is a physicist probably best known for the development of ion-storage devices and methods for accurate measurements of nuclear masses.
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Maria Goeppert-Mayer Maria Goeppert Mayer (June 28, 1906 – February 20, 1972) was a German-born American theoretical physicist, and Nobel laureate in Physics for proposing the nuclear shell model of the atomic nucleus. She was the second woman to win a Nobel prize in physics, after Marie Curie.