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noble metals - translation to greek
![Earth's core]]. Their abundance in [[meteoroid]] materials is relatively higher. Tellurium and selenium have been depleted from the crust due to formation of volatile hydrides.](https://commons.wikimedia.org/wiki/Special:FilePath/Elemental abundances.svg?width=200 "Earth's core]]. Their abundance in [[meteoroid]] materials is relatively higher. Tellurium and selenium have been depleted from the crust due to formation of volatile hydrides.")
![[[Chalcopyrite]], which is copper iron sulfide (CuFeS2), is the most abundant copper ore mineral](https://commons.wikimedia.org/wiki/Special:FilePath/Chalcopyrite-199453.jpg?width=200 "[[Chalcopyrite]], which is copper iron sulfide (CuFeS2), is the most abundant copper ore mineral")
.jpg?width=200 "Palladium")
![[[Acanthite]], or silver sulfide (Ag2S), is the most important silver ore](https://commons.wikimedia.org/wiki/Special:FilePath/Acanthite - Imiter mine, Jbel Saghro, Tinghir, Drâa-Tafilalet, Morocco.jpg?width=200 "[[Acanthite]], or silver sulfide (Ag2S), is the most important silver ore")
![Gold nugget from [[Australia]], nearly 9,000 g or 317 oz](https://commons.wikimedia.org/wiki/Special:FilePath/Gold nugget (Australia) 4 (16848647509).jpg?width=200 "Gold nugget from [[Australia]], nearly 9,000 g or 317 oz")
![[[Cinnabar]] or mercury sulfide (HgS) is the most common source ore for refining elemental mercury](https://commons.wikimedia.org/wiki/Special:FilePath/cinnabar09.jpg?width=200 "[[Cinnabar]] or mercury sulfide (HgS) is the most common source ore for refining elemental mercury")
.jpg?width=200 "alt=A small glass jar filled with small dull grey concave buttons. The pieces of selenium look like tiny mushrooms without their stems.")
Definition
Wikipedia
A noble metal is ordinarily regarded as a metallic chemical element that is generally resistant to corrosion and is usually found in nature in its raw form. Gold, platinum, and the other platinum group metals (ruthenium, rhodium, palladium, osmium, iridium) are most often so classified. Silver, copper and mercury are sometimes included as noble metals, however less often as each of these usually occurs in nature combined with sulfur.
In more specialized fields of study and applications the number of elements counted as noble metals can be smaller or larger. In physics, there are only three noble metals: copper, silver and gold. In dentistry, silver is not always counted as a noble metal since it is subject to corrosion when present in the mouth. In chemistry, the term noble metal is sometimes applied more broadly to any metallic or semimetallic element that does not react with a weak acid and give off hydrogen gas in the process. This broader set includes copper, mercury, technetium, rhenium, arsenic, antimony, bismuth and polonium, as well as gold, the six platinum group metals, and silver.
