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thorium 音标拼音: [θ'ɑriəm]

n. 放射性金属元素,符号Th,原子序90,钍

放射性金属元素,符号Th,原子序90,钍

WordNet (r) 3.0 (2006) (WordNet)

thorium
n 1: 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 [synonym:
{thorium}, {Th}, {atomic number 90}]

The Collaborative International Dictionary of English v.0.48 (gcide)

Thorium \Tho"ri*um\, n. [NL. See {Thorite}.] (Chem.)
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.
[1913 Webster]

The Elements Database (element)

thorium
Symbol: Th
Atomic number: 90
Atomic weight: 232.038
Grey radioactive metallic element. Belongs to actinoids. Found in
monazite sand
in Brazil, India and the US. Thorium-232 has a half-life of 1.39x10^10
years.
Can be used as a nuclear fuel for breeder reactors. Thorium-232 captures
slow
{neutron}s and breeds uranium-233. Discovered by Jons J. Berzelius in
1829.

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thorium	查看　thorium　在百度字典中的解释	百度英翻中〔查看〕
thorium	查看　thorium　在Google字典中的解释	Google英翻中〔查看〕
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