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Metal > BismuthBi - Bismuth A heavy metal, bismuth has been known since Claude Geoffroy distinguished it from lead in 1753. The pictured piece of bismuth may be observed with the emission spectrometer in CHM 154. Bismuth compounds may be used as an analytical reagents in qualitative analysis. Observe the melted crystals in the picture. Atomic number - 83 Density g/mL 9 .8 Atomic weight u 208 .9804 Melting point K 544 .52 Bonding radius A 1 .46 Boiling point K 1837 Atomic radius A 1 .63 Heat of vaporization kJ/mol 104 .8 Ionization Potential V 7 .289 Heat of fusion kJ/mol 11 .3 Electronegativity - 2 .02 Specific heat J/gK 0 .12 The oxide is mildly acidic. Crystal are rhombohedral. Electron config. : [Xe] 4f14 5d10 6s2 6p3 Bismuth is one of few metals that increase in volume upon solidification. It is the most diamagnetic of metals and has the second lowest thermal conductivity. Uses are catalysts, fire protection, thermocouples and amalgams. Bismuth compounds are used for pigments, pharmaceuticals and semiconductors.
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