These compounds are known as oxyanions.
For example:
* Sulfate: SO₄²⁻ (sulfur, oxygen)
* Nitrate: NO₃⁻ (nitrogen, oxygen)
* Phosphate: PO₄³⁻ (phosphorus, oxygen)
The metal part of the compound will be named as a cation, and the oxyanion will have the "-ate" ending. For example, sodium sulfate (Na₂SO₄) or calcium nitrate (Ca(NO₃)₂).
