Name :  Thallium
Symbol :  Tl
Atomic Number :  81
Atomic Weight :  204.3833
Specific Heat :  0.13 J/gK
Melting Point :  303.5°C
Vaporization :  164.10 kJ/mol
Boiling Point :  1457°C ±10°C
Electronegativity :  2.04
Density@293 K :  11.85 g/cm³
Discovered :  Sir William Crookes, England, 1861
Description :  Soft gray metal that looks like lead.
Uses :  Its compounds are used in rat and ant poisons. Also for detecting infrared radiation.