Platinum

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"Platinum." 30 August 2007. HowStuffWorks.com. <http://reference.howstuffworks.com/platinum-encyclopedia.htm> 15 October 2008.

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Platinum, PLAT uh nuhm, is a precious, silver-white metal that is even more valuable than gold. It ranks as one of the heaviest chemical elements, weighing more than 21 times as much as an equal volume of water.

Chromium

Chromium, KROH mee uhm, a chemical element, is a glossy, fairly soft, gray metal. It is sometimes called chrome. Chromium resists corrosion, and… See more »

Niobium

Niobium, ny OH bee uhm, also called columbium, is a soft, silver-white or gray metallic element. In nature, it occurs chiefly combined with… See more »

Tantalum

Tantalum, TAN tuh luhm, is a hard shiny, silver-colored metallic element. Its chemical symbol is Ta. Pure tantalum metal is ductile (easily… See more »

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Platinum

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