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neutron

(Encyclopedia)neutron, uncharged elementary particle of slightly greater mass than the proton. It was discovered by James Chadwick in 1932. The stable isotopes of all elements except hydrogen and helium contain a n...

competition, in biology

(Encyclopedia)competition, in biology, relationship between members of the same or different species in which individuals are adversely affected by those having the same living requirements, such as food or space. ...

Alfonso V, king of Aragón and Sicily

(Encyclopedia)Alfonso V (Alfonso the Magnanimous), 1396–1458, king of Aragón and Sicily (1416–58) and of Naples (1443–58), count of Barcelona. He was the son of Ferdinand I, whom he succeeded in Aragón and ...

Albion, ancient and literary name of Britain

(Encyclopedia)Albion ălˈbēən [key], ancient and literary name of Britain. It is usually restricted to England and is perhaps derived from the Latin albus meaning “white,” referring to the chalk cliffs of S ...

Alfonso I, king of Aragón and Navarre

(Encyclopedia)Alfonso I (Alfonso the Battler) ălfŏnˈsō, äl– [key], d. 1134, king of Aragón and Navarre (1104–34), brother and successor of Peter I. The husband of Urraca, queen of Castile, he fought unsuc...

Charles I, king of Naples and Sicily

(Encyclopedia)Charles I (Charles of Anjou), 1227–85, king of Naples and Sicily (1266–85), count of Anjou and Provence, youngest brother of King Louis IX of France. He took part in Louis's crusades to Egypt (124...

Charles XIII, king of Sweden and Norway

(Encyclopedia)Charles XIII, 1748–1818, king of Sweden (1809–18) and Norway (1814–18). He became regent for his nephew, Gustavus IV, after the assassination (1792) of his brother Gustavus III. He introduced so...

Charles XIV, king of Sweden and Norway

(Encyclopedia)Charles XIV (Charles John; Jean Baptiste Jules Bernadotte) zhäN bäptēstˈ zhül bĕrnädôtˈ [key], 1763–1844, king of Sweden and Norway (1818–44), French Revolutionary general. Bernadotte ros...

Charles XV, king of Sweden and Norway

(Encyclopedia)Charles XV, 1826–72, king of Sweden and Norway (1859–72), son and successor of Oscar I. A liberal and popular ruler, he consented to many reforms, including the creation of a bicameral parliament....

Albany, ancient and literary name of Scotland

(Encyclopedia)Albany, ancient and literary name of Scotland, N of the Firth of Forth and Firth of Clyde. Variants are Alban and Albin.