Here is the elemental composition of a 70 kg (154lb) human body by mass. It should also be noted, that these values will very from person to person by a fair amount, especially among the trace elements. Unfortunately, the variance of these values were not available, so the data should be taken for informational purposes only. Furthermore, it is expected that these values do not scale linearly (i.e. someone who weighs 100 kg, will not have 1.4 kg of calcium in threir body)

The table below shows the mass of each element, as well as the percent by mass, and approximate molar amount of the most prominent elements.

Mass of base elements for a 70 kg (154 lb) person.

   oxygen      43 kg   (61%, 2700 mol) 
   carbon      16 kg   (23%, 1300 mol) 
   hydrogen    7 kg    (10%, 6900 mol) 
   nitrogen    1.8 kg  (2.5%, 129 mol) 
   calcium     1.0 kg  (1.4%,  25 mol) 
   phosphorus  780 g   (1.1%,  25 mol) 
   potassium   140 g   (0.20%, 3.6 mol)  
   sulfur      140 g   (0.20%, 4.4 mol) 
   sodium      100 g   (0.14%, 4.3 mol) 
   chlorine    95 g    (0.14%, 2.7 mol) 
   magnesium   19 g    (0.03%, 0.78 mol) 
   iron        4.2 g       
   fluorine    2.6 g 
   zinc        2.3 g 
   silicon     1.0 g 
   rubidium    0.68 g 
   strontium   0.32 g 
   bromine     0.26 g 
   lead        0.12 g 
   copper      72 mg 
   aluminum    60 mg 
   cadmium     50 mg 
   cerium      40 mg 
   barium      22 mg 

   iodine      20 mg 
   tin         20 mg 
   titanium    20 mg 
   boron       18 mg 
   nickel      15 mg 
   selenium    15 mg 
   chromium    14 mg 
   manganese   12 mg 
   arsenic     7 mg 
   lithium     7 mg 
   cesium      6 mg 
   mercury     6 mg 
   germanium   5 mg 
   molybdenum  5 mg 
   cobalt      3 mg 
   antimony    2 mg 
   silver      2 mg 
   niobium     1.5 mg 
   zirconium   1 mg 
   lanthanum   0.8 mg 
   gallium     0.7 mg 
   tellurium   0.7 mg 
   yttrium     0.6 mg 
   bismuth     0.5 mg 
   thallium    0.5 mg 
   indium      0.4 mg 
   gold        0.2 mg
   scandium    0.2 mg
   tantalum    0.2 mg
   vanadium    0.11 mg
   thorium     0.1 mg
   uranium     0.1 mg
   samarium    50 µg
   beryllium   36 µg
   tungsten    20 µg
The raw data on which which this table is based is from Emsley, John, The Elements, 3rd ed., Clarendon Press, Oxford, 1998.

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