Well, I took my personal TN Archive and filtered all answers....

I found no Cerium (Dougs Answer) and I found no Ruthenium.

Thus I vote for Ruthenium as the third clue may fit..

> The name "ruthenium" was chosen by Osann because the analysed samples
> stemmed from the Ural Mountains in Russia.[30] The name itself derives
> from Ruthenia, the Latin word for Rus', a historical area that
> included present-day western Russia, Ukraine, Belarus, and parts of
> Slovakia and Poland.
(Wikipedia)

Best wishes
Matthias Mansfeld

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