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zirconium |
3 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Zirconium \Zir*co"ni*um\, n. [NL.] (Chem.) A rare element of the carbon-silicon group intermediate between the metals and nonmetals, obtained from the mineral zircon as a dark sooty powder, or as a gray metallic crystalline substance. Symbol Zr Atomic weight, 90.4. From WordNet r 1.6 [wn]: zirconium n : a lustrous gray strong metallic element resembling titanium; it is used in nuclear reactors as a neutron absorber; it occurs in baddeleyite but is obtained chiefly from zircon [syn: {Zr}, {atomic number 40}] From Elements database 20001107 [elements]: zirconium Symbol: Zr Atomic number: 40 Atomic weight: 91.22 Grey-white metallic transition element. Five natural isotopes and six radioactive isotopes are known Used in nuclear reactors for a {neutron} absorber. Discovered in 1789 by Martin Klaproth, isolated in 1824 by Berzelius.
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