The element sodium has 12 neutrons, 11 electrons and 11 protons. The number of electrons and protons come from the element's atomic number, which is also 11. The number of neutrons can be found by subtracting the atomic number from sodium's atomic mass of 23.
Sodium has a chemical symbol of Na. It is found in the alkali metals group in the periodic table. The element has three energy levels in its structure where all of its electrons reside. Sodium was first discovered in 1807 by Sir Humphrey Davy, and it is widely used today in both the medical and agriculture industries.