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The basic structure of the element silicon, symbol Si, an atom comprised of 14 protons, 14 neutrons, and 14 electrons.

In chemistry, silicon (LH:14), symbol Si, the 14th element (Z:14) of the periodic table, is an atom, with a mass of 28.09 amu, comprised of 14 protons, 14 neutrons, and 14 electrons; with an electron configuration of: [Ne] 3s2 3p2.


See main: Elemental composition of humans; Thims periodic table

The following is an early estimate of the percent silicon 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) [1]

Presently, it is known that in humans, sodium is the 15th most dominant element, by mass composition (0.001% mass), of the 26-elements in the standard human molecular formula.[2]

End matter


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

External links

Theta Delta ics T2.jpg