Final answer:
The correct name for the compound Na3P is Sodium Phosphide.
Step-by-step explanation:
The correct name for the compound Na3P is Sodium Phosphide. In this compound, the sodium ion has a +1 charge while the phosphide ion has a -3 charge. The ion formula is written as Na+P3-, and when the compound forms, it exists as a crystal lattice with sodium cations and phosphide anions held together by ionic bonds.