<span>H2SeO4 → H2(+1)S(+6)O4(-2)</span>
<span><span>H3AsO4 → H3(+1)As(+5)O4(-2)</span></span>
<span><span><span>HClO4 → H(+1)Cl(+7)O4(-2)</span></span></span>
<span><span><span><span>H3PO3 → H3(+1)P(+5)O3(-2)</span></span></span></span>
<span><span><span><span><span>H2Cr2O7 → H2(+1)Cr2(+6)O7(-2)</span></span></span></span></span>
<span><span><span><span><span><span>H2CrO4 → H2(+1)Cr(+6)O4(-2)</span></span></span></span></span></span>