Symbol: Tl
Atomic Number: 81
Atomic Weight: 204.383
Boiling Point: 1746 K
Melting Point: 577 K
Density at 300K: 11.85 g/cm3
Covalent radius: 1.48
Atomic radius: 2.08
Atomic volume: 17.20 cm3/mol
First ionization potental: 6.108 V
Specific heat capacity: 0.129 Jg-1K-1
Thermal conductivity: 46.1 Wm-1K-1
Electrical conductivity: 5.6*106Ω-1m-1
Heat of fusion: 4.27 kJ/mol
Heat of vaporization: 162.09 kJ/mol
Electronegativity: 2.04 (Pauling's)

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Thal"li*um (?), n. [NL., fr. Gr. young or green shoot or branch, twig. So called from a characteristic bright green line in its spectrum.] Chem.

A rare metallic element of the aluminium group found in some minerals, as certain pyrites, and also in the lead-chamber deposit in the manufacture of sulphuric acid. It is isolated as a heavy, soft, bluish white metal, easily oxidized in moist air, but preserved by keeping under water. Symbol Tl. Atomic weight 203.7.


© Webster 1913.

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