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actinium series actinium series
actinium series natural radioactive decay series beginning with uranium -235 (also called actinouranium) and ending with lead -207. See radioactivity .... Read more
actinide series actinide series
actinide series a series of radioactive metallic elements in Group 3 of the periodic table . Members of the series are often called actinides, although actinium (at. no. 89) is not always considered a member of the series. The series always includes the 14 elements with atomic numbers 90 through... Read more
radioactivity radioactivity
radioactivity Spontaneous change of the atomic nuclei of atoms, accompanied by the emission of radiation. The process by which a radioactive nucleus disintegrates is known as radioactive decay.... Read more
Otto Hahn Otto Hahn
Otto Hahn , 1879-1968, German chemist and physicist. His important contributions in the field of radioactivity include the discovery of several radioactive substances, the development of methods of separating radioactive particles and of studying chemical problems by the use of radioactive... Read more
hook hook
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Ac (actinium) Ac (actinium)
Ac symbol for the element actinium .... Read more
fallout fallout
fallout minute particles of radioactive material produced by nuclear explosions (see atomic bomb ; hydrogen bomb ; Chernobyl ) or by discharge from nuclear-power or atomic installations and scattered throughout the earth's atmosphere by winds and convection currents. Heavier fallout particles... Read more
cell theory cell theory
cell theory The theory that was born of the findings of Matthias Schleiden in 1838 and Theodor Schwann in 1839, who postulated, respectively, that plants and animals were made up of cells and that these units were basic to the structure and function of all organisms. Previously, in 1665, Robert... Read more
Nuclear Age Nuclear Age
NUCLEAR AGE. The nuclear age began in mid-July 1945 when an 18.6-kiloton nuclear bomb was detonated at the Trinity test site near Alamogordo, New Mexico. Three weeks later, on 6 August 1945, the world became aware of the existence of nuclear weapons when a U.S. B-29 bomber known as Enola Gay... Read more
Lise Meitner Lise Meitner
Lise Meitner , 1878-1968, Austrian-Swedish physicist and mathematician. She was professor at the Univ. of Berlin (1926-33). A refugee from Germany after 1938, she became associated with the Univ. of Stockholm and with the Nobel Institute at Stockholm. In 1917, working with Otto Hahn , she isolated... Read more

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