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strontium |
3 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Strontium \Stron"ti*um\, n. [NL. See {Strontia}.] (Chem.) A metallic element of the calcium group always naturally occurring combined, as in the minerals strontianite, celestite, etc It is isolated as a yellowish metal, somewhat malleable but harder than calcium. It is chiefly employed (as in the nitrate) to color pyrotechnic flames red. Symbol Sr Atomic weight 87.3. From WordNet r 1.6 [wn]: strontium n : a soft silver-white or yellowish metallic element of the alkali metal group turns yellow in air; occurs in celestite and strontianite [syn: {Sr}, {atomic number 38}] From Elements database 20001107 [elements]: strontium Symbol: Sr Atomic number: 38 Atomic weight: 87.62 Soft yellowish metallic element, belongs to group 2 of the periodic table. Highly reactive chemically. Sr-90 is present in radioactive fallout and has a half-life of 28 years. Discovered in 1798 by Klaproth and Hope, isolated in 1808 by Humphry Davy.
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