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actinide series
(Encyclopedia) 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…Richards, Theodore William
(Encyclopedia) Richards, Theodore William, 1868–1928, American chemist, b. Germantown, Pa., Ph.D. Harvard, 1888. Richards was a professor at Harvard from 1891 until his death in 1928. In 1914 he…transmutation of elements
(Encyclopedia) transmutation of elements, conversion of one chemical element into another. The expression has both historical and contemporary significance. The transmutation of certain metals into…geochemistry
(Encyclopedia) geochemistry, study of the chemical changes on the earth. More specifically, it is the study of the absolute and relative abundances of chemical elements in the minerals, soils, ores,…Rydberg, Johannes Robert
(Encyclopedia) Rydberg, Johannes RobertRydberg, Johannes Roberty&oomacr;ˈhänəs rôˈbərt rüdˈbĕryə [key], 1854–1919, Swedish physicist. Rydberg was a professor at Lund from 1901 to 1919. He is best…Oganessian, Yuri Tsolakovich
(Encyclopedia) Oganessian, Yuri Tsolakovich, 1933–, b. Rostov-na-Donu, Russian nuclear physicist, Ph.D. Moscow State Univ. (1963), Joint Institute for Nuclear Research (JINR), Dubna (1970). Joining…atomic number
(Encyclopedia) atomic number, often represented by the symbol Z, the number of protons in the nucleus of an atom, as well as the number of electrons in the neutral atom. Atoms with the same atomic…Seaborg, Glenn Theodore
(Encyclopedia) Seaborg, Glenn TheodoreSeaborg, Glenn Theodoresēˈbôrg [key], 1912–99, American chemist, b. Ishpeming, Mich., grad. Univ. of California at Los Angeles, 1934, Ph.D. Univ. of California…chemical reaction
(Encyclopedia) chemical reaction, process by which one or more substances may be transformed into one or more new substances. Energy is released or is absorbed, but no loss in total molecular weight…roentgenium
(Encyclopedia) roentgenium, artificially produced radioactive chemical element; symbol Rg; at. no. 111; mass number of most stable isotope 280; m.p., b.p., sp. gr., and valence unknown. Situated in…Trending
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