Noble metals are
metals that are resistant to
corrosion or
oxidation, unlike most
base metals. They tend to be
precious metals, often due to perceived rarity. Examples include
gold,
silver,
tantalum,
platinum,
palladium and
rhodium.Some of the noble metals can be dissolved in
aqua regia, a highly concentrated mixture of
acids.The term can also be used in a relative sense. A "
Galvanic series" is a hierarchy of metals (or other electrically conductive materials, including composites and
semimetals) that runs from noble to active, and allows designers to see at a glance how materials will interact in the environment used to generate the series. In this sense of the word,
graphite is more noble than silver (even though it is alchemically more base) and the relative nobility of many materials is highly dependent upon context, as for
aluminium and
stainless steel in conditions of varying
pH.
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