Silver, gold and silver alloys are all used in the process of manufacturing DVDs. With recordable discs, aluminum and zinc are also utilised. The amounts used are minute, however.
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Lanthanides are called rare earth metals because they were initially found in rare minerals, and they share similar chemical and physical properties. They are not actually rare in occurrence but are difficult to extract and purify, making them valuable and unique.
Transition metals and rare earth metals have unique properties that make them valuable in various applications. Transition metals have high melting points, conductivity, and malleability, making them useful in construction, electronics, and transportation. Rare earth metals have magnetic and luminescent properties, making them essential in technologies like smartphones, wind turbines, and electric vehicles. Together, these metals play a crucial role in modern technology and industry.
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They were rare metals that are found in the earth.
Lanthanides are called rare earth metals because they are not frequently found in concentrated deposits, making them less abundant than other metals. The name "rare earth" refers to the fact that these elements were initially believed to be rare when they were first discovered. However, they are actually more abundant than some other elements in the Earth's crust.
Three rare metals are: rhodium, francium, actinium.
Avalon Rare Metals's motto is 'Materials for Clean Technology'.
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Metals,Non-Metals,Metalloids, noble gases and rare metals
Rare metals are simply metals that aren't common. They don't necessarily have any chemical properties in common. (Many of them do, because they tend to cluster in certain regions of the periodic table - around iridium and rhodium.)Rare earth metals are, specifically, the lanthanides (scandium and yttrium are also sometimes included, because they tend to be found in the same mineral deposits where the lanthanides are found). They tend to be very similar chemically, to the point where it's actually difficult to separate them by their chemical properties.The rare earths are not really all that "rare": with the exception of promethium (which has no stable isotopes), they're considerably more common than the truly rare metals. Gadolinium is, for example, about a thousand times more common than gold.
The cost of DVDs can vary depending on the title, age, condition, and where you purchase them. On average, new DVDs can range from $10 to $20, while used DVDs can be found for as low as $1 to $5. Special edition or rare DVDs may cost more.