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A basic animated[1] visual of the sodium element, symbol Na, an atom comprised of 11 protons, 12 neutrons, and 11 electrons.

In chemistry, sodium (LH:12), symbol Na, the 11th element (Z:11) of the periodic table, is an atom, with a mass of 22.99 amu, comprised of 11 protons, 12 neutrons, and 11 electrons; with an electron configuration of: [Ne] 3s1.


See main: Elemental composition of humans; Thims periodic table

The following is an early estimate of the percent sodium in humans:

“The human body contains carbon 13.5%, hydrogen 9.1%, oxygen 72%, nitrogen 2.5%, phosphorus 1.15%, sodium 0.1 %, calcium 1.3%, magnesium 0.001%, iron 0.01%, and traces of silicon and fluorine.”
— Carl Kelsey (1916), The Physical Basis of Society (pg. 7) [2]

Presently, it is known that in humans, sodium is the 10th most dominant element, by mass composition (0.17% mass), of the 26-elements in the standard human molecular formula.[3]


  1. Sodium –
  2. Kelsey, Carl. (1916). The Physical Basis of Society (pg. 7). D. Appleton and Company.
  3. Thims, Libb. (2008). The Human Molecule (GB) (Amz) (Iss) (elemental composition table, pgs. 52-55). LuLu.

External links

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