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Rare metals and rare earths
Rare earths of a lanthanum subset, or lanthanides, are applied in production of permanent magnets, in iron and steel industry and non-ferrous metallurgy, in nuclear, electronic, chemical and other industries. |
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Non-metals
Non-metals are chemical elements that form simple elements with no
metal-specific qualities. Non-metals typically include 22 elements: gases - hydrogen,
nitrogen,
oxygen, fluor, chlorine and inert gases; liquids - bromine; solids - boron, carbon,
silicon, phosphorus,
arsenic, sulphur,
selenium, tellurium, iodine, astatine. |
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back
Silver (Ag) is a white metal, very ropey, malleable and flexible - a knife can cut into it. Silver is harder than gold, but softer than copper. It is the second popular metal to be used in jewelry production. Native silver is found rarely than native gold, as it bonds easier with other elements.
Specific mass of silver makes 10,50 g/cm3, its melting point - 960,5 °С, its Brinell number - 25.
Due to its unique qualities, such as high degree of electric and heat conductivity, reflective power, photosensitivity, etc., silver has a wide range of application. It is used in photography, electronics, electric engineering, precise instrument production, rocket production, medical science. Silver is also used to produce protective and decorative coatings, for monetization and, of course, jewelry fabrication.
875 pure silver alloys are most commonly used. It is used in jewelry production and items of table layout. The 916 pure alloys are used to produce enamelled items, the 960 pure alloys – for filigree jewelry. back |
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