1) Atomic number 90 2) Chemical element 3) Element discovered in 1829 4) Element number 90 5) Element with the symbol Th 6) Metal 7) Metallic element
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1) Radiothorium
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https://www.crosswordclues.com/clue/thorium
Thorium is a chemical element with the symbol Th and atomic number 90. A radioactive actinide metal, thorium is one of only three radioactive elements that still occurs in quantity in nature as a primordial element (the other two being bismuth and uranium).{efn|Traces of primordial plutonium-244 still exist in nature, but this does not occur in qu...
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http://en.wikipedia.org/wiki/Thorium
• (n.) A metallic element found in certain rare minerals, as thorite, pyrochlore, monazite, etc., and isolated as an infusible gray metallic powder which burns in the air and forms thoria; -- formerly called also thorinum. Symbol Th. Atomic weight 232.0.
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http://thinkexist.com/dictionary/meaning/thorium/
(Th), radioactive chemical element of the actinoid series of the periodic table, atomic number 90; it is a useful nuclear-reactor fuel. Discovered ... [10 related articles]
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http://www.britannica.com/eb/a-z/t/42
(Th) A silvery-white radioactive metallic element , one of the actinides. Its chief ore is monazite. Thorium is tetravalent, resembling zirconium and hafnium. It is used in magnesium alloys and to produce uranium-233 for atomic fuel. Thorium has 13 radioactive isotopes only on...
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http://www.daviddarling.info/encyclopedia/T/thorium.html
(Th) (thor´e-әm) a chemical element, atomic number 90, atomic weight 232.038.
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Tho'ri·um noun [ New Latin See
Thorite .]
(Chemistry) A metallic element found in certain rare minerals, as thorite, pyrochlore, monazite, etc., and isolated as an infusible gray metallic powder which burns in the air and forms thoria; -- formerly called also
thorinum . Symbol Th. A...
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http://www.encyclo.co.uk/webster/T/47
(Th) Type: Term Pronunciation: thō′rē-ŭm Definitions: 1. A radioactive metallic element; atomic no. 90, atomic wt. 232.0381. 232Th, the only naturally occurring nuclide, with a half-life of 14 ׀ 109 years, is used in colloidal form in electron microscopy as a stain for acid mucopolysaccharides. &nb...
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http://www.medilexicon.com/medicaldictionary.php?t=91723
Thorium is radioactive metal element of the tin group with the symbol Th. Thorium was discovered by Berzelius in 1828. It occurs principally in thorite and other rare minerals. It was formerly isolated by displacement by potassium fluothorate, and is a grey metallic powder. It burns brightly in oxygen.
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http://www.probertencyclopaedia.com/browse/GT.HTM
[
n] - a soft silvery-white tetravalent radioactive metallic element
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http://www.webdictionary.co.uk/definition.php?query=thorium
Thorium is a dark grey, radioactive metal of which the principal source is the ore, monazite, a complex phosphate of thorium, uranium, cerium and lanthanides. The metal is soft and ductile and is extracted by precipitation as the hydroxide, along with cerium and uranium; separation is achieved by further extraction with tributyl phosphate from an a...
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https://www.encyclo.co.uk/local/20687
Th noun a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
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https://www.encyclo.co.uk/local/20974
Dark-grey, radioactive, metallic element of the actinide series, atomic number 90, relative atomic mass 232.038. It occurs throughout the world in small quantities in minerals such as thorite and is widely distributed in monazite beach sands. It is one of the fissile elements (others include uranium and plutonium) and its longest-lived isot...
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https://www.encyclo.co.uk/local/21221
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