Elemental Composition of Human Body       ( reductionism )
    Major Elements Symbol           Percentage (by weight)
Oxygen O 65.0
Carbon C 18.5
Hydrogen H 9.5
Nitrogen N 3.3
Calcium Ca 1.5
Phosphorus P 1.0
Potassium K 0.4
Sulfur S 0.3
Sodium Na 0.2
Chlorine Cl 0.2
Magnesium Mg 0.1
 
Trace Elements

together
less than 0.1%

          
boron (B), chromium (Cr), cobalt (Co), copper (Cu), Fluorine (F), iodine (I), iron (Fe), manganese (Mn), molybdenum (Mo), selenium (Se), silicon (Si), tin(Sn), vanadium(V), & zinc(Zn).

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