Part of ==Key Stage 4=====Meaning===[[Carbonate]] is a [[compoundNegative Ion|negative ion]] which contains 1 with a relative [[carbonElectrical Charge|charge]] of -2 and a [[Chemical Formula|chemical formula]] of CO<sub>3 </sub><sup>-2</sup>. ===About Carbonate===: [[oxygenCarbonate]] has gained two [[atomelectron]]s to have a relative [[Electrical Charge|atomscharge]] of -2.: [[Carbonate]] forms [[Ionic Bond|ionic bond]]s with [[Positive Ion|positive ions]].: [[Carbonate]]s containing a [[Phosphate]] are [[Ionic Compound|bondedionic compounds]] together.