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Radium - Dictionary Definition and Overview |
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Radium : (noun)
1: an intensely radioactive metallic element that occurs in
minute amounts in uranium ores [syn: Ra, atomic number
88]
Based on WordNet 2.0
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Radium : \Ra`di*um\, n. [NL., fr. L. radius ray.] (Chem.)
An intensely radioactive metallic element found (combined) in
minute quantities in pitchblende, and various other uranium
minerals. Symbol, Ra; atomic weight, 226.4. Radium was
discovered by M. and Mme. Curie, of Paris, who in 1902
separated compounds of it by a tedious process from
pitchblende. Its compounds color flames carmine and give a
characteristic spectrum. It resembles barium chemically.
Radium preparations are remarkable for maintaining themselves
at a higher temperature than their surroundings, and for
their radiations, which are of three kinds: alpha rays, beta
rays, and gamma rays (see these terms). By reason of these
rays they ionize gases, affect photographic plates, cause
sores on the skin, and produce many other striking effects.
Their degree of activity depends on the proportion of radium
present, but not on its state of chemical combination or on
external conditions.The radioactivity of radium is therefore
an atomic property, and is explained as result from a
disintegration of the atom. This breaking up occurs in at
least seven stages; the successive main products have been
studied and are called
radium emanation or exradio,
radium A,
radium B,
radium C, etc. (The emanation is a heavy gas, the later
products are solids.) These products are regarded as
unstable elements, each with an atomic weight a little
lower than its predecessor. It is possible that lead is
the stable end product. At the same time the light gas
helium is formed; it probably consists of the expelled
alpha particles. The heat effect mentioned above is
ascribed to the impacts of these particles. Radium, in
turn, is believed to be formed indirectly by an
immeasurably slow disintegration of uranium.
Based on Webster's Revised Unabridged Dictionary
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Radium, KS (city, FIPS 58300)
Location: 38.17369 N, 98.89386 W
Population (1990): 47 (23 housing units)
Area: 0.1 sq km (land), 0.0 sq km (water)
Zip code(s): 67550
Radium, MN
Zip code(s): 56762
Based on U.S. Gazetteer (1990) [Census_Database]:
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Radium : Symbol: Ra
Atomic number: 88
Atomic weight: (226)
Radioactive metallic transuranic element, belongs to group 2 of the
periodic table. Most stable isotope, Ra-226 has a half-life of 1602 years,
which decays into radon. Isolated from pitchblende in 1898 Marie and
Pierre Curie.
Based on Elements database 20001107 [ELEM_Dictionary]:
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Radium : Radium: The celebrated radioactive element discovered by Marie and Pierre Curie in 1898.
Based on Elements database 20001107 [ELEM_Dictionary]:
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Example Usage of Radium |
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skweeker: @durocast Pandora occassionally, XM rest of the time mostly. Using an app called Radium. |
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Radium: @danegolden why does the Roku feed come out a week after the show? I still can't find video recorded feeds on itunes or the website |
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DJUNSTABLE: ♥ Headbanger Boogie by Lenny Dee & Radium #lastfm: http://bit.ly/5Cyqu9 amazon: http://bit.ly/4NGfwO |
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