Pure Metals and Minerals

Tantalum: [1] Melting Point: 2,996*C [2] Boiling Point: 5,429*C [3] very hard ductile material [4]d 16.69 [5] very resistant to chemical attack [6] reacts with fluorine, chlorine, d2 on heating. At high temperaturres absorbs several hundred times its volume of hydrogen. combines with nitrogen and carbon. [7] platinum substitute Silicon: [1] silica is quartz [2] poor conductor of low frequency elrctricity [3] d 25/4 2.33 [4] melting point: 1,410*C [5] attacked by hydrogen fluoride. soluble in molten alkali metals. Burns in fluorine and chlorine. Silver: [1] excellent conductor of low frequency electricity and heat [2] melting point: 960.5*C [3] boiling point: 2,000*C [4] d15 10.49 [5] inert to most acids,atmospheric oxygen. readily reacts with dilute h2no4; but, not concentrated h2so4. [6] has been used to purify drinking water due to toxicity to most lower forms of life. Aluminum: [1] non magnetic to lower frequency magnetism [2] d 2.70 [3] melting point: 660*C [4] boiling point: 2,327*C Boron Carbide: [1] abrasive [2] hardness less than industrial diamonds; but, higher than silicon carbide [3] moh's hardness: 9.3 [4] melting point: 2,350*C [5] boiling point: 3,500*C [6] black shiny colour Borazon: [1] hardest substance known [2] melting oint: 3,000*C [amorphous modification] [3] resistant to chemical attack