Photography (silver nitrate and silver halides are used in making films). 4. Electrical and electronic products (silver paints are used in making printed circuits; silver electrical contacts are used in making computer keyboards). 5. Dentistry (silver-mercury alloy is used in making dental amalgams). mol-1 * Electron Configuration: [Xe] 4f14 5d9 6s1 Physical: * Density (near room temperature): 21.45 g.cm-3 * Liquid Density (at melting point): 19.77 g.cm-3 * Melting Point: 1768.3 C, 3214.9 F, 2041.4 K * Boiling Point: 3825 C, 6917 F, 4098 K * Heat of Fusion: 22.17 kJ.mol-1 * Heat of Vaporization: 469 kJ. As an alloying agent, to improve platinum's resistance to corrosion. 2. For optical instruments. 3. As an electrical contact material (because of its stable resistance to contact and low resistance to electricity). 4. As a filter in X-ray systems (such as mammography). 5. In surfaces of high quality pens (because of its high mechanical and chemical resistance). It specifically refers to an alluvial deposit of detrital material, such as gravel, which contains particles of precious chemical elements. The term "placer gold", therefore, refers to gold that has formed in rocks moved and placed on stream beds by some geological forces and by the action of water. The discoverers, John Deason and Richard Oates, found the nugget just a couple inches below the surface on a slope in a place that's sometimes called Black Reef. Records have the following details about the Welcome Stranger: Gross weight: 3,523.5 troy ounces (241.61 pounds) Trimmed weight: 2,520 troy ounces (172.8 pounds) Net weight: 2,315.5 troy ounces (158.78 pounds) Measurement: 2 feet (0.61 meter) x 1.02 feet (0.31 meter) For their find, Deason and Oates were paid about 19,068 by the London Chartered Bank (located in the town of Dunolly in Victoria), where they took the nugget. continues to import a big part of its total consumption of the precious metal from some of the countries mentioned above. Since rhenium and its compounds are used in very small amounts, very little is known about their toxicity. So far, only a few rhenium compounds have been tested for toxicity, and these include rhenium trichloride and potassium perrhenate.