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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. List of semiconductor materials - Wikipedia

   en.wikipedia.org/wiki/List_of_semiconductor...

   A compound semiconductor is a semiconductor compound composed of chemical elements of at least two different species. These semiconductors form for example in periodic table groups 13–15 (old groups III–V), for example of elements from the Boron group (old group III, boron, aluminium, gallium, indium) and from group 15 (old group V, nitrogen, phosphorus, arsenic, antimony, bismuth).

5. 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 ...

6. Flame test - Wikipedia

   en.wikipedia.org/wiki/Flame_test

   A flame test involves introducing a sample of the element or compound to a hot, non-luminous flame and observing the color of the flame that results. [4] The compound can be made into a paste with concentrated hydrochloric acid, as metal halides, being volatile, give better results. [5] Different flames can be tried to verify the accuracy of ...

7. 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 ...