radium

Definition of Radium in English :

see synonyms of radium

Noun

1. atomic number 88, ra, radium

an intensely radioactive metallic element that occurs in minute amounts in uranium ores

WordNet Lexical Database for English. Princeton University. 2010.

Radium

see synonyms of radium

noun

a.

a highly radioactive luminescent white element of the alkaline earth group of metals. It occurs in pitchblende, carnotite, and other uranium ores, and is used in radiotherapy and in luminous paints. Symbol: Ra; atomic no: 88; half-life of most stable isotope, 226Ra: 1620 years; valency: 2; relative density: 5; melting pt: 700°C; boiling pt: 1140°C

b.

(as modifier)

radium needle

Radium

see synonyms of radium

noun

a radioactive, metallic chemical element, one of the alkaline-earth metals, found in very small amounts in pitchblende and other minerals containing uranium: it undergoes spontaneous atomic disintegration through several stages, emitting alpha, beta, and gamma rays and finally forming an isotope of lead: radium is used in neutron sources and in the treatment of cancer and other diseases: symbol, Ra; at. no., 88

see the periodic table of elements in the Reference Supplement

Radium

see synonyms of radium

n. Symbol Ra

A rare, brilliant white, luminescent, highly radioactive metallic element found in very small amounts in uranium ores, having more than 40 isotopes and isomers with mass numbers between 201 and 234, of which Ra-226 with a half-life of 1,600 years is the most common. It is used as a neutron source for some research purposes and was formerly widely used in cancer radiotherapy and as a constituent of luminescent paints. Atomic number 88; melting point 696°C; boiling point 1,737°C; specific gravity 5; valence 2. See Periodic Table.

Radium

Noun

Radium

Radium

Radium

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