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Precious Metals and Commodities Weekly

Rhodium: Although rhodium is inert (being a noble metal, as almost all the other precious metals are), it can be reactive, especially if used as compounds. In its basic form, however, rhodium is not known to cause any harm. Iridium: Iridium, when finely divided, can pose some hazards - it can ignite in air. mol-1 Atomic: Oxidation States: 1, 2, 3 Electronegativity: 1.93 (Pauling scale) Atomic Radius: 144 picometre Covalent Radius: 145 5 picometre Van der Waals Radius: 172 picometre Ionization Energies: 731 kJ.mol-1 (first), 2070 kJ.mol-1 (second), 3361 kJ.mol-1 (third) Despite having higher electrical conductivity than copper, silver isn't as much used for electrical purposes as copper is. cm-3 Liquid Density (at melting point): 10.38 g.cm-3 Melting Point: 1554.9 C, 2830.82 F, 1828.05 K Boiling Point: 2963 C, 5365 F, 3236 K Heat of Fusion: 16.74 kJ.mol-1 Heat of Vaporization: 362 kJ.mol-1 Atomic: Oxidation States: 0, +1, +2, +4, +6 Electronegativity: 2.2 (Pauling scale) Atomic Radius: 137 picometre Covalent Radius: 139 6 picometre Van der Waals Radius: 163 picometre Ionization Energies: 804.4 kJ. 1/4 ounce coin - With 7.776 g platinum content, 7.78 g in weight, and 22 mm in diameter. 4. 1/2 ounce coin - With 15.552 g platinum content, 15.6 g in weight, and 27 mm in diameter. 5. 1 ounce coin - With 31.103 g platinum content, 31.119 g in weight, and 32.7 mm in diameter. The coins have no currency value. One-tenth ounce coin (0.11 troy ounce in weight, 1.35 millimeters thick, and 16.55 millimeters in diameter). 2. Quarter ounce coin (0.27 troy ounce in weight, 1.89 millimeters thick, and 22.06 millimeters in diameter). 3. Half ounce coin (0.55 troy ounce in weight, 2.22 millimeters thick, and 27.07 millimeters in diameter). Perhaps the best example of a silver coin is the Canadian Silver Maple Leaf, which consists of 99.99% pure silver. Silver coins may either be "fine silver" or "junk silver". Junk silver coins are older coins with a lower percentage of silver. Examples of these are the dime, quarter, and fifty-cent U. 

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