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Palladium - Notable characteristics | | Palladium - Notable characteristics: Encyclopedia II - Palladium - Notable characteristics | | Palladium is a soft steel-white metal that resembles platinum, doesn't tarnish in air, and is the least dense and has the lowest melting point of the platinum group metals. It is soft and ductile when annealed and greatly increases its strength and hardness when it is cold-worked. Palladium is chemically attacked by sulfuric and nitric acid but dissolves slowly in hydrochloric acid. This metal al ...
See also:Palladium, Palladium - Notable characteristics, Palladium - Applications, Palladium - History, Palladium - Occurrence, Palladium - Isotopes | | | Palladium, Palladium - Applications, Palladium - History, Palladium - Isotopes, Palladium - Notable characteristics, Palladium - Occurrence | | |
| | | Palladium: Encyclopedia II - Palladium - Notable characteristics
Palladium - Notable characteristics
Palladium is a soft steel-white metal that resembles platinum, doesn't tarnish in air, and is the least dense and has the lowest melting point of the platinum group metals. It is soft and ductile when annealed and greatly increases its strength and hardness when it is cold-worked. Palladium is chemically attacked by sulfuric and nitric acid but dissolves slowly in hydrochloric acid. This metal also does not react with oxygen at normal temperatures.
This metal has the uncommon ability to absorb up to 900 times its own volume of hydrogen at room temperatures. It is thought that this possibly forms palladium hydride - PdH2 - but it is not yet clear if this is a true chemical compound.
Common oxidation states of palladium are 0,+1, +2 and +4. Although originally +3 was thought of as one of the fundamental oxidation states of palladium, there is no evidence for palladium occuring in the +3 oxidation state; this has been investigated via X-ray diffraction for a number of compounds, indicating a dimer of Palladium(II) and Palladium(IV) instead. Recently, palladium compounds in which palladium has oxidation state +6 were synthesised.
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 Adapted from the Wikipedia article "Notable characteristics", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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