| Re | rhenium |
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| rhenium | <chemical> Rhenium. A metal, atomic number 75, atomic weight 186.2, symbol re. Chemical name: Rhenium (12 Dec 1998) |
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| sesquioxide | <chemistry> An oxide containing three atoms of oxygen with two atoms (or radicals) of some other substance; thus, alumina, Al2O3 is a sesquioxide. Origin: Sesqui- + oxide. Source: Websters Dictionary (01 Mar 1998) |
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