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actinium series

(Encyclopedia)actinium series, natural radioactive decay series beginning with uranium-235 (also called actinouranium) and ending with lead-207. See radioactivity. ...

Sikhote-Alin

(Encyclopedia)Sikhote-Alin sēkhətĕ-əlyēnˈyə [key], mountain range, c.625 mi (990 km) long, S Russian Far East. It is composed of a series of ridges lying between the Sea of Japan and the Ussuri and Amur rive...

metamorphism

(Encyclopedia)metamorphism, in geology, process of change in the structure, texture, or composition of rocks caused by agents of heat, deforming pressure, shearing stress, hot, chemically active fluids, or a combin...

isomer

(Encyclopedia)isomer īˈsəmər [key], in chemistry, one of two or more compounds having the same molecular formula but different structures (arrangements of atoms in the molecule). Isomerism is the occurrence of ...

iron

(Encyclopedia)iron, metallic chemical element; symbol Fe [Lat. ferrum]; at. no. 26; at. wt. 55.845; m.p. about 1,535℃; b.p. about 2,750℃; sp. gr. 7.87 at 20℃; valence +2, +3, +4, or +6. Iron is biologically s...

malleability

(Encyclopedia)malleability, property of a metal describing the ease with which it can be hammered, forged, pressed, or rolled into thin sheets. Metals vary in this respect; pure gold is the most malleable. Silver, ...

Bingham Canyon

(Encyclopedia)Bingham Canyon or Bingham, uninc. village, N central Utah, near Tooele, in a canyon of the Oquirrh Mts. SW of Salt Lake City. At first (1848) a farm of the Mormons Thomas and Sanford Bingham, it becam...

beryllium

(Encyclopedia)beryllium bərĭlˈēəm [key] [from beryl ], metallic chemical element; symbol Be; at. no. 4; at. wt. 9.01218; m.p. about 1,278℃; b.p. 2,970℃ (estimated); sp. gr. 1.85 at 20℃; valence +2. Ber...

helium

(Encyclopedia)helium hēˈlēəm [key], gaseous chemical element; symbol He; at. no. 2; at. wt. 4.0026; m.p. below −272℃ at 26 atmospheres pressure; b.p. −268.934℃ at 1 atmosphere pressure; density 0.1785 g...

Np

(Encyclopedia)Np, symbol for element neptunium. ...