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Moseley, Henry Gwyn Jeffreys

(Encyclopedia)Moseley, Henry Gwyn Jeffreys mōzˈlē [key], 1887–1915, English physicist, grad. Trinity College, Oxford, 1910. He began his research under Ernest Rutherford while serving as lecturer at the Univ. ...

promethium

(Encyclopedia)promethium prōmēˈthēəm [key], artificially produced radioactive chemical element; symbol Pm; at. no. 61; mass no. of most stable isotope 145; m.p. 1,042℃; b.p. 3,000℃ (estimated); sp. gr. unk...

lanthanum

(Encyclopedia)lanthanum lănˈthənəm [key] [Gr.,=to lie hidden], metallic chemical element; symbol La; at. no. 57; at. wt. 138.90547; m.p. about 920℃; b.p. about 3,460℃; sp. gr. 6.19 at 25℃; valence +3. Lan...

rubidium

(Encyclopedia)rubidium ro͞obĭdˈēəm [key], metallic chemical element; symbol Rb; at. no. 37; at. wt. 85.4678; m.p. 38.89℃; b.p. 686℃; sp. gr. 1.53 at 20℃; valence +1. Rubidium is a very soft silver-white ...

argon

(Encyclopedia)argon ärˈgŏn [key] [Gr.,=inert], gaseous chemical element; symbol Ar; at. no. 18; at. wt. 39.948; m.p. −189.2℃; b.p. −185.7℃; density 1.784 grams per liter at STP; valence 0. Argon is a col...

District of Columbia, University of the

(Encyclopedia)District of Columbia, University of the, at Washington, D.C.; coeducational; land-grant and federally supported; est. 1976 with the merger of three existing colleges; predominantly African American. I...

Field of the Cloth of Gold

(Encyclopedia)Field of the Cloth of Gold, locality between Guines and Ardres, not far from Calais, in France, where in 1520 Henry VIII of England and Francis I of France met for the purpose of arranging an alliance...

Protocols of the Elders of Zion

(Encyclopedia)Protocols of the Elders of Zion, a fraudulent document that reported the alleged proceedings of a conference of Jews in the late 19th cent., at which they discussed plans to overthrow Christianity thr...

Rulers of France since 987 (table)

(Encyclopedia)Rulers of France since 987(including dates of reign) The Capetians House of Valois House of Bourbon The First Republic The First Empire Bourbon Restoration House of Bourbon-Orléans T...

Rulers of Spain since 1474 (table)

(Encyclopedia)Rulers of Spain since 1474(including dates of reign) Union of Castile and Aragón Hapsburg Dynasty Bourbon Dynasty French Intrusion Bourbon Restoration Elective Monarchy First Republic ...