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The basic structure of the element iron, symbol Fe, an atom comprised of 26 protons, 30 neutrons, and 26 electrons.

In chemistry, iron (TR:157) (LH:12) (TL:169), symbol Fe, the 26th element (Z:26) of the periodic table, is an atom, with a mass of 55.85 amu, comprised of 26 protons, 30 neutrons, and 26 electrons; with an electron configuration of: [Ar] 3d6 4s2.



See main: Elemental composition of humans; Thims periodic table

The following is an early estimate of the percent iron 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 12th most dominant element, by mass composition (0.012% 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