cation Ca²+ 3+ Mn 2+ Ba Cu anion NO₂ 104 BrO PO some ionic compounds empirical formula Ca(NO₂)₂ Mn (104) Ba (BrO3)₂ Cu₂PO4 name of compound calcium(II) nitrite Manganese(III) periodate barium(II) bromate copper(I) phosphate 4 X

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