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Thallium (81Tl204.3833)
[7440-28-0]

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Elemental Form

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.
Melting Point303.5°CBoiling Point1457°C
Density11.85g/cm3Themal Conductivity0.093cal/cm2/cm/s/°C
Specific Heat @ 20°C0.031cal/g°CHeat of Fusion5.04cal/g
Heat of Vaporization190cal/gAtomic Volume17.2W/D
First Ionization Energy141K-cal/g-moleElectronegativity1.8Pauling's
Covalent Radius1.48AngstromsBrinell Hardness2
Linear Coefficient of Expansion28x10-6K-1Electrical Resistivity18µΩ-cm
Crystal StructureHexagonalTensile Strength1300psi