Tl2SO4
Thallium(II) sulfate, with the chemical formula Tl2SO4, is an inorganic compound. It is the salt formed between thallium in the +2 oxidation state and the sulfate anion. Thallium is a heavy metal, and its compounds are generally known for their toxicity. While thallium(I) sulfate (Tl2SO4) and thallium(III) sulfate (Tl2(SO4)3) are more commonly encountered and studied, thallium(II) sulfate represents a less stable or frequently synthesized oxidation state for thallium in this salt form.
The existence and properties of thallium(II) sulfate are less documented than those of its +1 and +3