Thallium has several oxides:
Thallium(I) oxide Tl2O Thallium(III) oxide Tl2O3 Thallium(I) superoxide or thallium dioxide TlO2 Tl4O3
Wikipedia
Thallium has several oxides:
Thallium(I) oxide Tl2O Thallium(III) oxide Tl2O3 Thallium(I) superoxide or thallium dioxide TlO2 Tl4O3