* Nitrogen (N) is a nonmetal and typically forms covalent bonds.

* Carbonate (CO3^2-) is a polyatomic ion with a -2 charge.

To form a stable compound, the charges need to balance. However, nitrogen doesn't readily form ionic bonds with carbonate ions to achieve a neutral charge.

Instead of "nitrogen carbonate," you might be thinking of a related compound:

* Ammonium carbonate ((NH4)2CO3): This compound consists of ammonium ions (NH4+) and carbonate ions (CO3^2-), which balance out the charges.

Let me know if you had a different compound in mind, and I can help you find the formula!