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hafnium

(Encyclopedia)hafnium hăfˈnēəm [key], metallic chemical element; symbol Hf; at. no. 72; at. wt. 178.49; m.p. about 2,227℃; b.p. 4,602℃; sp. gr. 13.31 at 20℃; valence +4. Hafnium is a lustrous, ductile, si...

tantalum

(Encyclopedia)tantalum tănˈtələm [key] [from Tantalus], metallic chemical element; symbol Ta; at. no. 73; at. wt. 180.94788; m.p. 2,996℃; b.p. 5,400±100℃; sp. gr. 16.65 at 20℃; valence +2, +3, +4, or +5....

cadmium

(Encyclopedia)cadmium kădˈmēəm [key] [from cadmia, Lat. for calamine, with which cadmium is found associated], metallic chemical element; symbol Cd; at. no. 48; at. wt. 112.411; m.p. 321℃; b.p. 765℃; sp. gr...

bismuth

(Encyclopedia)bismuth bĭzˈməth [key] [Ger. Weisse Masse=white mass], metallic chemical element; symbol Bi; at. no. 83; at. wt. 208.98040; m.p. 271.3℃; b.p. about 1,560℃; sp. gr. 9.75 at 20℃; valence +3 or ...

Negishi, Ei-ichi

(Encyclopedia)Negishi, Ei-ichi, 1935–2021, Japanese chemist, b. Changchum, China, Univ. of Tokyo (B.Eng., 1958), Univ. of Pennsylvania (Ph.D...

Ruffin, Edmund

(Encyclopedia)Ruffin, Edmund rŭfˈĭn [key], 1794–1865, American agriculturist, one of the Southern fire-eaters, b. Prince George co., Va. His interest in improving impoverished land led him to become a pioneer ...

Reye's syndrome

(Encyclopedia)Reye's syndrome rīz [key], rare but life-threatening disease characterized by acute encephalopathy and fatty infiltration of internal organs, especially the liver. It occurs almost entirely in childr...

Rockne, Knute Kenneth

(Encyclopedia)Rockne, Knute Kenneth no͞ot, rŏkˈnē [key], 1888–1931, American football coach, b. Norway, B.S. Notre Dame, 1914. In 1893 he settled with his parents in Chicago. He excelled at football at Notre ...

Shimomura, Osamu

(Encyclopedia)Shimomura, Osamu, 1928–2018, Japanese organic chemist and marine biologist, Ph.D. Nagoya Univ., 1960. Shimomura was a researcher at Princeton (1960–82) and a professor (1982–2001) simultaneously...

Curl, Robert Floyd, Jr.

(Encyclopedia)Curl, Robert Floyd, Jr., 1933–, American chemist, b. Alice, Tex., Ph.D. Univ. of California, Berkeley, 1957. Curl has been a professor at Rice Univ. in Houston, Tex., since 1958. In 1996 he was awar...