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Ca₃(PO₄)₂ Ca+II P +V O-II
PH₃ P -III H +I
P₂O₇⁻⁴ P +V O -II
Ca(II)₃(P(V)O(-II)₄)₂
P(III)H(-I)₃
P(V)₂O(-II)₇⁻⁴
Ca₃(PO₄)₂...Ca(+II), P(+V), O(-II)
PH₃...........P(-III), H(+I)
P₂O₇⁻⁴.......P(+V), O(-II)