Search results
Results From The WOW.Com Content Network
The 1789 discovery of uranium in the mineral pitchblende is credited to Martin Heinrich Klaproth, who named the new element after the recently discovered planet Uranus. Eugène-Melchior Péligot was the first person to isolate the metal, and its radioactive properties were discovered in 1896 by Henri Becquerel.
Klaproth discovered uranium (1789) [6] and zirconium (1789). He was also involved in the discovery or co-discovery of titanium (1795), strontium (1793), cerium (1803), and chromium (1797) and confirmed the previous discoveries of tellurium (1798) and beryllium (1798). [7] [8] Klaproth was a member and director of the Berlin Academy of Sciences. [2]
Patricio "Paddy" Martinez (1881– August 26, 1969) [1] was an American prospector and shepherd who discovered uranium at Haystack Mesa in the San Juan Basin near Grants, New Mexico, in 1950. [2] This was the first discovery in the Grants Uranium District, and led to a uranium boom that lasted almost 30 years. The San Juan Basin yielded 60% of ...
Obtained by irradiating uranium with neutrons, it was the first transuranium element discovered. [179] Shortly before that, Yoshio Nishina and Kenjiro Kimura discovered the uranium isotope 237 U and found that it beta decays into 237 93, but were unable to measure the activity of the element 93 product because its half-life was too long.
1941 – February – Plutonium discovered by Glenn Seaborg and Arthur Wahl at the University of California, Berkeley. 1941 – May – A review committee postulates that the United States will not isolate enough uranium-235 to build an atomic bomb until 1945. [6]
Electron discovered by J. J. Thomson [4] 1899 Alpha particle discovered by Ernest Rutherford in uranium radiation [5] 1900 Gamma ray (a high-energy photon) discovered by Paul Villard in uranium decay [6] 1911 Atomic nucleus identified by Ernest Rutherford, based on scattering observed by Hans Geiger and Ernest Marsden [7] 1919
Uranium-235 (235 U or U-235) is an isotope of uranium making up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238, it is fissile, i.e., it can sustain a nuclear chain reaction. It is the only fissile isotope that exists in nature as a primordial nuclide. Uranium-235 has a half-life of 703.8 million years.
Uranium was first discovered in the area of Cardiff, Ontario, in 1922 by W. M. Richardson [18] at a location first called "the Richardson deposit" and later known as "the Fission property". [19] Between 1929 and 1931, [19] attempts were made to extract radon from the uranium ore. [20]