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Ruthenium (Ru)

Ruthenium compounds are encountered relatively rarely by most people, as there is not much use of ruthenium. All ruthenium compounds should be regarded as highly toxic and as carcinogenic. Compounds of ruthenium stain the skin very strongly. It seems that ingested ruthenium is retained strongly in bones. Ruthenium oxide, RuO 4, is highly toxic and volatile, and to be avoided.

Sources :http://www.lenntech.com/periodic-chart.htm