Thallium Properties, Molecular Formula, Applications - WorldOfChemicals

Thallium Properties




The two chemists, William Crookes and Claude-Auguste Lamy, discovered thallium independently in 1861 by the newly developed method of flame spectroscopy. Both discovered the new element in residues of sulfuric acid production. Approximately 60–70% of thallium production is used in the electronics industry, and the rest is used in the pharmaceutical industry and in glass manufacturing. It is also used in infrared detectors. It is highly toxic and was used in rat poisons and insecticides. Its use has been cut back or eliminated in many countries because of its nonselective toxicity.

Chemical Properties

Appearance Silver-Grey Metal
Atomic Number 81
Atomic Weight 204.383 g/mol
Block p
Boiling Point 1473 °C
CAS Number 7440-28-0
Class 6.1
Crystal Structure Hexagonal
Density 11.85 g/cm3
EINECS Number 231-138-1
Electron Configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 4d10 5p6 4f14 5d10 6s2 6p1
Group 13
Ionization Energy 589.4 KJ/mol
Melting Point 304 °C
Oxidation State 3,1
PG 2
Period 6
RTECS Number XG3425000
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