class of elements From Wikipedia, the free encyclopedia
The thallium halides come in two oxidation states: monohalides, where thallium has the oxidation state +1, and trihalides, where thallium generally has oxidation state +3.
The monohalides all contain thallium with oxidation state +1.
Thallium(III) halides are very rare. Some of them are unstable. The thallium(III) iodide does not form. They are quite different to aluminium, gallium and indium trihalides.
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