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2. Tantalum - Wikipedia

   en.wikipedia.org/wiki/Tantalum

   Tantalum is a chemical element; it has symbol Ta and atomic number 73. Previously known as tantalium, [citation needed] it is named after Tantalus, a figure in Greek mythology. [11] Tantalum is a very hard, ductile, lustrous, blue-gray transition metal that is highly corrosion-resistant.

3. Refractory metals - Wikipedia

   en.wikipedia.org/wiki/Refractory_metals

   Most definitions of the term 'refractory metals' list the extraordinarily high melting point as a key requirement for inclusion. By one definition, a melting point above 4,000 °F (2,200 °C) is necessary to qualify, which includes iridium, osmium, niobium, molybdenum, tantalum, tungsten, rhenium, rhodium, ruthenium and hafnium. [2]

4. Hardnesses of the elements (data page) - Wikipedia

   en.wikipedia.org/wiki/Hardnesses_of_the_elements...

   This page was last edited on 16 November 2024, at 12:16 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

5. Not All Jewelry That Says Platinum Is Really Platinum: FTC - AOL

   www.aol.com/news/2010-12-18-not-all-jewelry-that...

   Before paying hard-earned cash for platinum jewelry this holiday season, look for the stamp to make sure you're getting what you pay for, the U.S. Federal Trade Commission says. The FTC announced ...

6. Platinum - Wikipedia

   en.wikipedia.org/wiki/Platinum

   Platinum is a chemical element; it has symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish platina, a diminutive of plata "silver". [7] [8] Platinum is a member of the platinum group of elements and group 10 of the periodic table of ...

7. Overrated: Platinum jewelry expensive solution for non ...

   www.aol.com/2008/09/14/overrated-platinum-for...

   Platinum is a particularly useful metal; over a third of the annual world production goes for catalytic converters, and new fuel cell technology depends on it as well. However, when it comes to ...