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This article provides some important information about gold, white gold, rose gold, platinum, and rhodium plating.

Many different alloys exist today and new ones are developed from time to time, each having different properties.

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Hafnium is a chemical element with symbol Hf and atomic number 72.

Hafnium is named after Hafnia, the Latin name for Copenhagen, where it was discovered. Some semiconductor fabrication processes use its oxide for integrated circuits at 45 nm and smaller feature lengths.

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established (1844) the existence of this rare, bright metal and retained the name his countryman Gottfried Wilhelm Osann had suggested (1828) for a platinum-group element whose discovery had remained inconclusive.

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The most notable nuclear properties of hafnium are its high thermal neutron-capture cross-section and that the nuclei of several different hafnium isotopes readily absorb two or more neutrons apiece.

Fine jewelry is created from precious metals, or more commonly, mixtures of metals known as alloys.

Gold purity is expressed in relation to 24 units or karats.

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