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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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Silver
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 °Ñ, its Brinell number - 25.
Gold
Gold (Au) is a precious metal of a canary yellow colour; it is most sturdy and forgeable, compared to other metals. It can be easily flattened into most thin leaves; 1g of gold can be flattened into a leaf of 1 m2. Gold is very shiny and can be easily polished.
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