SG Heritage Dictionary

Ruthenium [Noun] Webster's Dictionary 1913

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.

Ruthenium Encyclopedia Britannica

RUTHENIUM. See Platinum.

9th ed. Encyclopædia Britannica, vol. 21, p. 112
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