The ionic compound formed from the reaction of sodium ion (Na⁺) with carbonate ion (CO₃²⁻) is sodium carbonate (Na₂CO₃).

Here's why:

* Sodium ion (Na⁺) has a +1 charge.

* Carbonate ion (CO₃²⁻) has a -2 charge.

To form a neutral compound, you need two sodium ions (2 x +1 = +2) to balance the -2 charge of the carbonate ion.