Search results
Results from the WOW.Com Content Network
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.
In 1899, he discovered the radioactive element actinium, as a result of continuing the work with pitchblende that the Curies had initiated. After the death of Pierre Curie in 1906, Debierne helped Marie Curie carry on and worked with her in teaching and research. In 1911, he and Marie Curie prepared radium in metallic form in visible amounts ...
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.
Named for the Americas, because it was discovered in the United States; by analogy with europium . The name of the continent America itself is derived from the name of the Italian navigator Amerigo Vespucci. Curium (Cm) 96 Curie, Marie and Pierre eponym Named in honour of Marie and Pierre Curie, who discovered radium and researched radioactivity.
Actinium-225 is a member of the radioactive neptunium series; [60] it was first discovered in 1947 as a decay product of uranium-233 and it is an α-emitter with a half-life of 10 days. Actinium-225 is less available than actinium-228, but is more promising in radiotracer applications. [ 30 ]
Collecting drainage in the Iron Mountain Mine. The mine is located at in the Klamath Mountains of Shasta County, about 9 miles northwest of ReddingThe mine area is drained by several creeks which ultimately enter the Spring Creek Reservoir, formed by the Spring Creek Dam, and finally the Keswick Reservoir formed by a dam across the Sacramento River.
In the late 1930s, the first four actinides (actinium, thorium, protactinium, and uranium) were known. They were believed to form a fourth series of transition metals, characterized by the filling of 6 d orbitals, in which thorium, protactinium, and uranium were respective homologs of hafnium, tantalum , and tungsten. [ 2 ]
This is an accepted version of this page This is the latest accepted revision, reviewed on 2 January 2025. Periodic table of the elements with eight or more periods Extended periodic table Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium ...