(Encyclopedia) hafniumhafniumhăfˈnēəm [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…
(Encyclopedia)
CE5
Common features in representative groups of the phylum Chordata
ChordataChordatakôrdāˈtə, –däˈ– [key], phylum of animals having a notochord, or dorsal stiffening rod, as the…
(Encyclopedia) Perot, H. Ross (Henry Ross Perot), 1930–2019, American business executive and political leader, b. Texarkana, Tex., as Henry Ray Perot, grad. Annapolis, 1953. In 1957 he resigned his…
(Encyclopedia) Carver, Raymond, 1938–88, American short-story writer, b. Clatskanie, Oreg. He was raised in the Pacific Northwest, where he often set his sparely written tales of everyday blue-collar…
(Encyclopedia) actiniumactiniumăktĭnˈēəm [key] [Gr.,=like a ray], radioactive chemical element; symbol Ac; at. no. 89; mass number of most stable isotope 227; m.p. about 1,050℃; b.p. 3,200℃±300℃; sp…
(Encyclopedia) periodic law, statement of a periodic recurrence of chemical and physical properties of the elements when the elements are arranged in order of increasing atomic number. Such an…
(Encyclopedia) dark energy, repulsive force that opposes the self-attraction of matter (see gravitation) and causes the expansion of the universe to accelerate. The search for dark energy was…
(Encyclopedia) Jones, Quincy (Quincy Delight Jones, Jr.), 1933–, African-American musician, composer, bandleader, and music executive, b. Chicago. Jones played trumpet and sang gospel growing up, and…
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