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zinc

(Encyclopedia)zinc, metallic chemical element; symbol Zn; at. no. 30; at. wt. 65.38; m.p. 419.58℃; b.p. 907℃; sp. gr. 7.133 at 25℃; valence +2. Zinc is a lustrous bluish-white metal. It is found in Group 12 o...

platinum

(Encyclopedia)platinum plătˈənəm [key], metallic chemical element; symbol Pt; at. no. 78; at. wt. 195.084; m.p. 1,772℃; b.p. 3,827±100℃; sp. gr. 21.45 at 20℃; valence +2 or +4. Pure platinum is a malleab...

McClatchy, J. D.

(Encyclopedia)McClatchy, J. D. (Joseph Donald McClatchy, Jr.), 1945–2018, American poet, b. Bryn Mawr, Pa., B.A. Georgetown Univ., 1967, Ph.D. Yale, 1974. His first collection of poems, Scenes from Another Life (...

Sansovino, Jacopo

(Encyclopedia)Sansovino, Jacopo sänsōvēˈnō [key], 1486–1570, Italian sculptor and architect of the Renaissance. His surname was taken in place of his own, Tatti, as homage to the Florentine sculptor Andrea ...

Rhett, Robert Barnwell

(Encyclopedia)Rhett, Robert Barnwell, 1800–1876, American politician, b. Beaufort, S.C. His family changed its name from Smith to Rhett (after a colonial ancestor) in 1837. A lawyer, he was a state legislator, st...

Marcus, Rudolph Arthur

(Encyclopedia)Marcus, Rudolph Arthur, 1923–, American chemist, b. Montreal, Canada. A professor at the California Institute of Technology, he was awarded the 1992 Nobel Prize in Chemistry for developing a theory ...

Clifton

(Encyclopedia)Clifton, industrial city (2020 pop. 90,296), Passaic co., NE N.J., on the Passaic River; settled 1685, set off from Passaic and inc. 1917. It has steel,...

Sand Springs

(Encyclopedia)Sand Springs, city (1990 pop. 15,346), Tulsa co., NE Okla., an industrial suburb of Tulsa, on the Arkansas River; founded 1907. There are oil and natural-gas wells and food-processing and chemical ind...

Martínez de Rozas, Juan

(Encyclopedia)Martínez de Rozas, Juan hwän märtēˈnās dā rōˈsäs [key], 1759–1813, Chilean revolutionist, b. Mendoza, Argentina. A lawyer and scholar, he was a leading instigator of revolutionary ideas. I...

F

(Encyclopedia)F, sixth letter of the alphabet. The Greek letter corresponding to it, digamma, which probably represented a sound like w, disappeared before the classical period. In Western alphabets f has usually r...