What is Thallium halide?
The '''thallium halides''' come in two [[oxidation state]]s: [[#Monohalides|monohalides]], where [[thallium]] has the oxidation state +1, and [[#Trihalides|trihalides]], where thallium generally has oxidation state +3. == Monohalides == [[Image:Thallium-iodide-3D-vdW.png|thumb|150px|right|Thallium(I) iodide has a distorted rock salt structure]] The monohalides all contain thallium with oxidation state +1. *[[Thallium(I) fluoride]], a white [[crystal]]line solid. It is soluble in water, unlike the other thallium monohalides.<ref>U.Haussermann, P.Berastegui, S.Carlson, J.Haines, and J.Leger ''Angewandte Chemie'', 31, pp. 4760 (2001)</ref> *[[Thallium(I) chloride]], sensitive to light. It is a white crystalline solid. *[[Thallium(I) bromide]], sensitive to light. A pale yellow crystalline solid. *[[Thallium(I) iodide]], at room temperature it is a yellow crystalline solid. At higher temperatures the colour changes to red. == Trihalides == 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. *'''Thallium(III) fluoride''', also known as thallic fluoride, is made of [[thallium]] in its +3 [[oxidation state]] and [[fluoride]] [[ion]]s. It is made by reacting [[thallium(III) oxide]] with [[bromine trifluoride]], [[fluorine]], or [[sulfur tetrafluoride]] at a warm temperature. *'''Thallium(III) chloride''', also known as thallic chloride, is made of thallium in its +3 oxidation state and [[chloride]] ions. It [[disproportionation|disproportionates]] above 40°C, making [[thallium(I) chloride]] and [[chlorine]]. It is made by reacting thallium(I) chloride with chlorine in an [[organic chemistry|organic]] solution. *'''Thallium(III) bromide''', also known as thallic bromide, is made of thallium in its +3 oxidation state and [[bromide]] ions. It disproportionates at a low temperature to [[thallium(I) bromide]] and [[bromine]]. It can be made by reacting thallium(I) bromide with bromine in water or a