Define Noble metals. Write at least three properties of noble metals by giving examples.

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Noble metal, any of several metallic chemical elements that have outstanding resistance to oxidation, even at high temperatures; the grouping is not strictly defined but usually is considered to include ruthenium,rhodium,palladium,silver,osmium,iridium,platinum, and gold
We can take three most popular noble elements among them and analyse their properties.
Gold: It is a good conductor of heat and energy. Many collectors and investors enjoy Gold because of its value and beautiful luster. This is one of the reasons Gold jewelry is common. Gold in and of itself is largely unaffected by air and reagents, which provides Gold with longevity as a metal. Of all Precious Metals, Gold is the softest in terms of malleability and it is certainly worth consideration for any collection or investment.

Silver: Silver is highly ductile, which makes it a popular metal for industrial needs. Electrical applications like filaments and energy production utilize Silver as an important source for energy because it has the highest conductivity of any metal. Because of the less volatile nature of Silver and its high tolerance to air exposure, Silver is less likely to fade, tarnish or break down.

Platinum: Platinum has the third highest density of all elements.This lustrous metal is often confused with Silver because of the color, but the properties are vastly different. It is one of the most malleable of the Precious Metals, but it is also highly resistant to tarnishing and corrosion. Much like Gold, Platinum does not oxidize and is affected by natural environment factors. Popular in use for jewelry because of its shiny and scratch-resistant properties, Platinum is used in many industrial applications because of its conductive features and its ability to be an alloy without being chemically volatile.

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