Noble metals are situated in the middle of the periodic table, and belong to the group of transition metals. All noble metals belong to second and third transition series, and VIIb, VIII, and Ib groups of the periodic table.
Properties and Uses of Noble Metals:
â— Atomic number: 47
â— Chemical name: Ag
â—‹ Highly malleable and ductile metal, but not as much as gold.
â– Like gold, silver is utilized for jewelry and coins.
â– Unlike gold, silver oxidizes, which means objects made from silver can form a black layer on the surface.
â– Silver nitrate is an effective antiseptic.
â— Atomic number: 79
â— Chemical name: Au
o Originated from the Latin word â€˜aurum,â€™ which means â€˜shining dawn.â€™
o Density = 19.3 per cubic cm, which is slightly greater than lead.
o Extraordinary chemical stability, and at the same time, can conduct heat and electricity easily.
â–ª Considered an exemplary scientific material, due to its properties.
â— Atomic number: 78
â— Chemical name: Pt
o Malleable and ductile, but is denser compared to other metals.
o Internal combustion engines
â–ª Used as catalytic converters, where carbon monoxide is produced after being oxidized by platinum.
o Electrochemical research
â–ª Used as an electrode.
â— Atomic number: 46
â— Chemical name: Pd
o Silvery-white in color.
o Corrosion resilient.
o Very high capacity to absorb hydrogen (in the ratio of about 900:1 by volume).
o Hydrogenation and dehydrogenation reactions
â–ª Due to its high capacity to absorb hydrogen, it is an excellent catalyst for these types of reactions.
â–ª Example: in an organic compound, if a palladium catalyst is used in a carbon-carbon double bond, it can be hydrogenated very easily.
o Surgical instruments
o Automotive and marine spark plugs
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