Oxygen, chloride, nitrate, carbonate, hydroxide, sulfate, sulfite, bicarbonate, phosphate and ammonium, ferrous (Connection problem): Chemical formula and name of iron ion, copper ion, aluminum ion, calcium ion, magnesium ion and zinc ion

Aluminum chloride, calcium chloride, copper chloride, iron hydroxide, copper hydroxide, aluminum hydroxide, magnesium chloride, magnesium hydroxide

Why is the valence of sulfite the same as that of sulfate

The valence of sulfite SO32-, S is +4, so the valence of sulfite is -2.
The valence of SO42-, S is +6, so the valence of SO42- is -2.

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