Platinum - Law Dictionary Search Results
Home Dictionary Name: platinumPlatinum
A metallic element of atomic number 78 one of the noble metals classed with silver and gold as a precious metal occurring native or alloyed with other metals and also as the platinum arsenide sperrylite It is a heavy tin white metal which is ductile and malleable but very infusible melting point 1772deg C and characterized by its resistance to strong chemical reagents It is used for crucibles in laboratory operations as a catalyst in jewelry for stills for sulphuric acid rarely for coin and in the form of foil and wire for many purposes Specific gravity 215 Atomic weight 1951 Symbol Pt Formerly called platina...
Ruthenium
A rare element of the light platinum group found associated with platinum ores and isolated as a hard brittle steel gray metal which is very infusible Symbol Ru Atomic weight 1035 Specific gravity 1226 See Platinum metals under Platinum...
Palladium
A rare metallic element of the light platinum group found native and also alloyed with platinum and gold It is a silver white metal resembling platinum and like it permanent and untarnished in the air but is more easily fusible with a melting point of 1555deg C It can also be prepared as a finely divided black powder It is unique in its power of absorbing hydrogen which it does to the extent of nearly a thousand volumes forming the alloy Pd2H It is used for graduated circles and verniers for plating certain silver goods and somewhat in dentistry It was so named in 1804 by Wollaston from the asteroid Pallas which was discovered in 1802 Symbol Pd Atomic number 46 Atomic weight 10642 Density 120...
iridium
A rare metallic element of atomic number 77 of the same group as platinum which it much resembles being silver white and indifferent to most corrosive agents but harder more brittle and with a higher melting temperature 2410deg C versus platinum 1772deg C With the exception of osmium it is the heaviest substance known its specific gravity being 224 Symbol Ir Atomic weight 19222...
osmium
A rare metallic element of the platinum group with atomic number 76 It is found native as an alloy in platinum ore and in iridosmine It is a hard infusible bluish or grayish white metal and the heaviest substance known Its tetroxide is used in histological experiments to stain tissues Symbol Os Atomic weight 1902 Specific gravity 22477...
Platiniridium
A natural alloy of platinum and iridium occurring in grayish metallic rounded or cubical grains with platinum...
Rhodium
A rare element of the light platinum group It is found in platinum ores and obtained free as a white inert metal which it is very difficult to fuse Symbol Rh Atomic weight 1041 Specific gravity 12...
Bougie deacutecimale
A photometric standard used in France having the value of one twentieth of the Violle platinum standard or slightly less than a British standard candle Called also decimal candle...
Crucible
A vessel or melting pot composed of some very refractory substance as clay graphite platinum and used for melting and calcining substances which require a strong degree of heat as metals ores etc...
Davyum
A rare metallic element found in platinum ore It is a white malleable substance Symbol Da Atomic weight 154...
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