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Marguerite Catherine Perey (19 October 1909 – 13 May 1975) was a French physicist and a student of Marie Curie. In 1939, Perey discovered the element francium by purifying samples of lanthanum that contained actinium. In 1962, she was the first woman to be elected to the French Académie des Sciences, an honor denied to her mentor Curie.
Marguerite Perey presented her thesis, L'élément 87: Actinium K, at the Sorbonne, defending her proof that she had discovered the last of the natural elements. The element with atomic number 87 has, ever since, been referred to by the name proposed by Perey, in honor of her native land, "francium". [49]
Marguerite Perey discovered francium in 1939. Francium was the last element discovered in nature, rather than synthesized. Outside the laboratory, francium is extremely rare, with trace amounts found in uranium and thorium ores, where the isotope francium-223 is continually formed and continually
Marguerite Perey discovered francium in 1939. Francium was the last element discovered in nature , rather than synthesized. Outside the laboratory, francium is extremely rare, with trace amounts found in uranium and thorium ores, where the isotope francium-223 is continually formed and continually decays.
Marguerite Perey, 65, French chemist who discovered the element francium Bob Wills , 70, American country western singer Richard Hollingshead , 75, inventor (in 1933) of the drive-in theater
Electrometer by Jean Peltier. Foucault pendulum by Léon Foucault (who also developed and named the Gyroscope) in February 1851 in the Meridian of the Paris Observatory. Ocean thermal energy conversion in 1881 by Jacques-Arsène d'Arsonval (first OTEC plant in 1930 in Cuba by his student Georges Claude).
The first woman admitted as a correspondent member was a student of Curie's, Marguerite Perey, in 1962. The first female full member was Yvonne Choquet-Bruhat in 1979. [23] Membership in the academy is highly geared towards representing common French populace demographics. French population increases and changes in the early 21st century led to ...
January 7 – French physicist Marguerite Perey identifies francium, the last chemical element first discovered in nature, as a decay product of 227 Ac. [5] April 30 – Nylon fabric is first introduced to the general public at the New York World's Fair. July – Edward Adelbert Doisy of Saint Louis University publishes the chemical structure ...
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