Mg3P2: Mg(II), P(-III)H2SO4: H(+I), S(+VI), O(-II)K2Cr2O7: K(+I), Cr(VI), O(-II)NaCLO4: Na(+I), Cl(+VII), O(-II)Ca3(PO4)2: Ca(II), P(V), O(-II)
Mg3P2: Mg(II), P(-III)
H2SO4: H(+I), S(+VI), O(-II)
K2Cr2O7: K(+I), Cr(VI), O(-II)
NaCLO4: Na(+I), Cl(+VII), O(-II)
Ca3(PO4)2: Ca(II), P(V), O(-II)