Noble Metal
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, rhodium, palladium, silver, osmium, iridium, platinum, and gold.
Other sources include mercury or even rhenium as a noble metal. On the other hand, titanium, niobium, and tantalum are not included as noble metals despite the fact that they are very resistant to corrosion. Noble metals should not be confused with precious metals (although many noble metals have high value).
Read more about Noble Metal: Introduction, Electrochemistry
Famous quotes containing the words noble and/or metal:
“Upon Saint Crispin’s day
Fought was this noble fray,
Which fame did not delay
To England to carry.
On when shall Englishmen
With such acts fill a pen,
Or England breed again
Such a King Harry?”
—Michael Drayton (1563–1631)
“There is a lot of talk now about metal detectors and gun control. Both are good things. But they are no more a solution than forks and spoons are a solution to world hunger.”
—Anna Quindlen (b. 1953)