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The noble metals are metals that are resistant to corisson 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 most commonly considered to be ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, and gold.
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Silver and gold are present at the bottom of the reactivity series of metals.They are unreactivity metals and do not react with water,acids and alkalis.They ,therefore occur free state in nature.These are known as noble metals.
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