To calculate the mass of one atom of sodium, you need to refer to the periodic table and find the atomic mass of sodium. The atomic mass is typically listed beneath the element's symbol.
For sodium (Na), the atomic mass is approximately 22.99 atomic mass units (amu) or 22.99 Daltons (Da). This value represents the average mass of a sodium atom, taking into account the different isotopes of sodium and their relative abundances.
Therefore, the mass of one atom of sodium is approximately 22.99 amu or 22.99 Da.