Kovové ruthenium, foto Alchemist-hp (talk) (www.pse-mendelejew.de) GFDL 1.2, http://www.gnu.org/licenses/old-licenses/fdl-1.2.html, via Wikimedia Commons.

Kovové ruthenium, foto Alchemist-hp (talk) (www.pse-mendelejew.de) GFDL 1.2, http://www.gnu.org/licenses/old-licenses/fdl-1.2.html, via Wikimedia Commons.