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It is one of the most expensive metals in the world which has various colors, including a hard-brittle blue-gray and blue-black. The density of osmium is 22.59 g/ cm cubic, the second densest element. Ruthenium. The Ruthenium is a chemical element whose symbol and atomic number are Ru and no. 44.It is one of the most expensive metals in the world, the inert rare to most chemicals. It belongs to the platinum group of the periodic table whose name was given to it by Karl Ernst.he most expensive metals in the world. Not only the price is high, the quality of the metals itself is certainly unbelievable. So, if we want to sell it back, the price wonât go down. There are many people who invest on these most expensive metals in order to get a higher price in the next sale.
Ruthenium usually occurs as a minor component of platinum ores; annual production is about 20 tonnes. Most ruthenium produced is used for wear-resistant electrical contacts and the production of thick-film resistors. A minor application of ruthenium is its use in some platinum alloys, and as a catalyst.uthenium usually occurs as a minor component of platinum ores; annual production is about 20 tonnes. Most ruthenium produced is used for wear-resistant electrical contacts and the production of thick-film resistors. A minor application of ruthenium is its use in some platinum alloys, and as a catalyst.