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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.
Actinium is a chemical element; it has symbol Ac and atomic number 89. It was first isolated by Friedrich Oskar Giesel in 1902, who gave it the name emanium; the element got its name by being wrongly identified with a substance André-Louis Debierne found in 1899 and called actinium.
André-Louis Debierne (French pronunciation: [ɑ̃dʁe lwi dəbjɛʁn]; 14 July 1874 – 31 August 1949) was a French chemist.He is often considered the discoverer of the element actinium, though H. W. Kirby disputed this in 1971 and gave credit instead to German chemist Friedrich Oskar Giesel.
Named in honour of Marie and Pierre Curie, who discovered radium and researched radioactivity. Berkelium (Bk) 97 University of California, Berkeley: Anglo-Saxon via English toponym Named for the University of California, Berkeley, where it was discovered. The city of Berkeley itself was named after George Berkeley. Californium (Cf) 98 ...
It was discovered in 1905 by T. Godlewski, [2] [3] [4] a Polish chemist from Kraków, and was historically known as actinium X (AcX). [ 5 ] [ 6 ] Radium-223 dichloride is an alpha particle-emitting radiotherapy drug that mimics calcium and forms complexes with hydroxyapatite at areas of increased bone turnover. [ 7 ]
During construction, millions of fossils were found at a California high school, including megalodon teeth, extinct dolphins, and bird skulls.
Indeed, Fermi discovered elements he did not recognise. He tested for elements below uranium in the periodic table: radon, actinium, polonium, as far back as lead – it was none of these. So, in 1934, the infallible Fermi declared to the world he had created elements heavier than uranium.
In the 2020s, China produced ca. 50% of world's tellurium and was the only country that mined Te as the main target rather than a by-product. This dominance was driven by the rapid expansion of solar cell industry in China.