| tech. | noble metal | благородный металл (a metal (e.g. gold, silver, or platinum) that resists attack by acids and other reagents and does not corrode. COED. The noble metals are metals that are resistant to corrosion and oxidation in moist air, unlike most base metals. They tend to be precious, often due to their rarity in the Earth's crust. The noble metals are considered to be (in order of increasing atomic number) ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), silver (Ag).  wikipedia.org Alexander Demidov) |
