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atomic weight

(Encyclopedia)atomic weight, mean (weighted average) of the masses of all the naturally occurring isotopes of a chemical element, as contrasted with atomic mass, which is the mass of any individual isotope. Althoug...

Strindberg, Johan August

(Encyclopedia)Strindberg, Johan August strĭndˈbərg, Swed. yo͞oˈhän ouˈgəst strĭndˈbĕrˌyə [key], 1849–1912, Swedish dramatist and novelist. He was a master of the Swedish language and an innovator in ...

periodic law

(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 arrangement in the for...

Nabokov, Vladimir

(Encyclopedia)Nabokov, Vladimir vlädēˈmĭr näbôˈkŏf [key], 1899–1977, Russian-American author, b. St. Petersburg, Russia. He emigrated to England after the Russian Revolution of 1917 and graduated from Cam...

Kennedy, Robert Francis

(Encyclopedia)Kennedy, Robert Francis, 1925–68, American politician, U.S. Attorney General (1961–64), b. Brookline, Mass., younger brother of President John F. Kennedy and son of Joseph P. Kennedy. A graduate o...

Vienna, city and province, Austria

(Encyclopedia)Vienna vēĕnˈə [key], Ger. Wien, city and province (1991 pop. 1,539,848), 160 sq mi (414 sq km), capital and largest city of Austria and administrative seat of Lower Austria, NE Austria, on the Dan...

constellation, in astronomy

(Encyclopedia)CE5 Constellations: Southern sky CE5 Constellations: Southern sky CE5 Constellations: Southern sky constellation, in common usage, group of stars that appear to form a configuration in the...

Charles VI, Holy Roman emperor

(Encyclopedia)Charles VI, 1685–1740, Holy Roman emperor (1711–40), king of Bohemia (1711–40) and, as Charles III, king of Hungary (1712–40); brother and successor of Holy Roman Emperor Joseph I. Charles was...

Anthropocene

(Encyclopedia)Anthropocene Epoch, an unofficial term used by scientists to describe a period of time—up to the present—in which humanity has impacted the planet on a global scale. The phrase was fir...

Aeschylus

(Encyclopedia)Aeschylus ĕsˈkĭləs, ēsˈ– [key], 525–456 b.c., Athenian tragic dramatist, b. Eleusis. The first of the three great Greek writers of tragedy, Aeschylus was the predecessor of Sophocles and Eur...