The Atomic Mass of sodium is 22.989768 a.m.u.
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Sodium is a meta element. Atomic mass of it is 23.
Sodium's atomic mass is 23. :)
There is no Na3. The atomic weight for sodium (Na) on the periodic table is 22.989770.
The atomic mass is the mass of a molecule, atomic particle or sub-atomic particle.
== The equation of atomic mass is protons+nuetrons== atomic mass. ===