cm-3 Melting Point: 3033 C, 5491 F, 3306 K Boiling Point: 5012 C, 9054 F, 5285 K Heat of Fusion: 57.85 kJ.mol-1 Heat of Vaporization: 738 kJ.mol-1 Atomic: Oxidation States: 8, 7, 6, 5, 4, 3, 2, 1, 0, -1, -2 Electronegativity: 2.2 (Pauling scale) Atomic Radius: 135 picometre Covalent Radius: 144 4 picometre Ionization Energies: 840 kJ. cm-3 Melting Point: 1064.18 C, 1947.52 F, 1337.33 K Boiling Point: 2856 C, 5173 F, 3129 K Heat of Fusion: 12.55 kJ.mol-1 Heat of Vaporization: 324 kJ.mol-1 Atomic: Oxidation States: -1, 1, 2, 3, 4, 5 Electronegativity: 2.54 (Pauling scale) Atomic Radius: 144 picometre Covalent Radius: 136 6 picometre Van der Waals Radius: 166 picometre Ionization Energies: 890.1 kJ. The Manx Noble: The Manx Noble platinum bullion coins were minted from 1983 to 1989 by the Pobjoy Mint, the leading private mint in Europe. The coins were offered in five varieties: 1. 1/20 oz. coin - With 1.555 g platinum content, 1.556 g in weight, and 13.9 mm in diameter. 2. 1/10 ounce coin - With 3.11 g platinum content, 3.112 g in weight, and 16.5 mm in diameter. mol-1 * Heat of Vaporization: 469 kJ.mol-1 Atomic: * Oxidation States: 6, 5, 4, 3, 2, 1, -1, -2 * Electronegativity: 2.28 (Pauling scale) * Atomic Radius: 139 picometre * Covalent Radius: 136 5 picometre * Van der Waals Radius: 175 picometre * Ionization Energies: 870 kJ.mol-1 (first), 1791 kJ.mol-1 (second) Platinum is known to occur as only three thousandth parts-per notation (0.003 ppm) in the Earth's crust. The ranking appears different when the estimated world market prices, per troy ounce, of these nine precious metals are considered (estimates as of January 2010): 1st: Rhodium - USD2,750 2nd: Platinum - USD1,555 3rd: Gold - USD1,131 4th: Palladium - USD424 5th: Iridium - USD408 6th: Osmium - USD380 7th: Rhenium - USD194 8th: Ruthenium - USD173 9th: Silver - USD18 Of the nine precious metals, gold and silver are the best known. Ruthenium - VIIIb/5; Ru -> Ru2+ + 2 e-; 0.455 V 2. Rhodium - VIIIb/5; Rh -> Rh2+ + 2 e-; 0.600 V 3. Palladium - VIIIb/5; Pd -> Pd2+ + 2 e-; 0.987 V 4. Silver - Ib/5; Ag -> Ag+ + e-; 0.7996 V 5. Osmium - VIIIb/6; Os + 4 H2O -> OsO4 + 8 H+ + 8 e-; 0.838 V 6. Iridium - VIIIb/6; Ir -> Ir3+ + 3 e-; 1.156 V 7.