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Ruthenium

Webster's Dictionary

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(n.) A rare element of the light platinum group, found associated with platinum ores, and isolated as a hard, brittle steel-gray metal which is very infusible. Symbol Ru. Atomic weight 103.5. Specific gravity 12.26. See Platinum metals, under Platinum.

Bibliography Information
Webster, Noah. Entry for 'Ruthenium'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​r/ruthenium.html. 1828.
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