Ca(Na2)3

The given chemical formula "Ca(Na2)3" represents a compound containing calcium (Ca) and sodium (Na) ions. The formula suggests that there are three sodium ions for every calcium ion. However, the parentheses indicate that the sodium ions are grouped together, suggesting that there are three sodium ions bonded with a calcium ion.

To correctly represent this compound, we need to calculate the overall charge balance. Calcium is a group 2 element and has a charge of +2, while sodium is a group 1 element and has a charge of +1. Since there are three sodium ions, the total positive charge from the sodium ions will be +3 (3 x +1). Therefore, the calcium ion must have a charge of -3 (-3 x -1) to balance the overall charge of the compound.

The correct chemical formula for this compound would be Ca(Na2)3, indicating that there is one calcium ion bonded to three sodium ions.