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Thallium was discovered spectroscopically and is named for its green spectral line. It has a metallic luster when first exposed to air, but quickly develops a bluish-gray tone that resembles lead. Thallium is very soft and malleable, inelastic, and heavy. It occurs as a mixture of two isotopes.
|Property Name||Property Value||Property Name||Property Value|
|Atomic Code||(81Tl204.3833)||Atomic Volume||17.2W/D|
|CAS #||7440-28-0||First Ionization Energy||141K-cal/g-mole|
|Melting Point||303.5°C||Covalent Radius||1.48Angstroms|
|Boiling Point||1457°C||Brinell Hardness||2|
|Density||11.85g/cm3||Linear Coefficient of Expansion||28x10-6K-1|
|Themal Conductivity||0.093cal/cm2/cm/s/°C||Electrical Resistivity||18µΩ-cm|
|Specific Heat @ 20°C||0.031cal/g°C||Crystal Structure||Hexagonal|
|Heat of Fusion||5.04cal/g||Tensile Strength||1300psi|
|Heat of Vaporization||190cal/g|