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Group 16 trioxides (XO₃) show a +6 oxidation state. S forms SO₃, the most stable and common trioxide, unlike O, Se, or Te where XO₃ is less prevalent.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table
Stability of group 17 oxides in high oxidation states increases down the group. I₂O₅ (I, +5) is the most stable, unlike F₂O, Cl₂O₇, or BrO₃.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table
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