* Atomic Mass: The mass of an atom is primarily determined by its protons and neutrons in the nucleus. Electrons contribute a very tiny amount of mass.
* Ionization: When a sodium atom loses an electron to become a sodium ion (Na+), it only loses a single electron. This loss of a single electron is so small that it has a practically insignificant impact on the overall mass of the atom.
In essence, the mass of a sodium ion is essentially the same as the mass of a sodium atom. The difference is so small that it is usually not considered in most practical applications.
