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 ! Atomic number !! Element !! Percent of MassThomas J. Glover, comp., Pocket Ref, 3rd ed. (Littleton: Sequoia, 2003), p. 324 (), which in turn cites Geigy Scientific Tables, Ciba-Geigy Limited, Basel, Switzerland, 1984.Distribution of elements in the human body (by weight) Retrieved on 2007-12-06) !! Mass (kg)J. Emsley, The Element, 3rd ed., Oxford: Clarendon Press, 1998.!!Atomic percent!!Positive health role in mammalsNeilsen, cited!!Group 
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 | 8 || Oxygen || 65 || 43|| 24 || Yes (water, electron acceptor) /No (Reactive Oxygen Species) || 16 
 |-  
 | 6 || Carbon || 18 || 16 || 12 || Yes (organic compounds are hydrocarbon derivatives) || 14 
 |-  
 | 1 || Hydrogen || 10 || 7|| 63 || Yes (e.g. water) || 1 
 |-  
 | 7 || Nitrogen || 3 || 1.8|| 0.58 || Yes (e.g. DNA and amino acids) || 15 
 |-  
 | 20 || Calcium || 1.4 || 1.0|| 0.24 || Yes (e.g. Calmodulin and Hydroxylapatite in bones)|| 2 
 |-  
 | 15 || Phosphorus || 1.1 ||  0.78 || 0.14 || Yes (e.g. DNA and phosphorylation) || 15 
 |-  
 | 19 || Potassium || 0.25 ||  0.14 || 0.033 || Yes (e.g. Na+/K+-ATPase) || 1 
 |-  
 | 16 || Sulfur || 0.25 || 0.14|| 0.038 || Yes (e.g. Cysteine and Methionine) || 16 
 |-  
 | 11 || Sodium || 0.15 || 0.10|| 0.037 || Yes (e.g. Na+/K+-ATPase) || 1 
 |-  
 | 17 || Chlorine || 0.15 || 0.095|| 0.024 || Yes (e.g. Cl-transporting ATPase) || 17 
 |-  
 | 12 || Magnesium || 0.05 || 0.019 || 0.0070 || Yes (e.g. binding to ATP and other nucleotides) || 2 
 |-  
 | 26 || Iron* || 0.006 || 0.0042|| 0.00067 || Yes (e.g. Hemoglobin) || 8 
 |-  
 | 9 || Fluorine || 0.0037 || 0.0026|| 0.0012 || Yes/No (topically hardens teeth; toxic in higher amounts) || 17 
 |-  
 | 30 || Zinc || 0.0032 || 0.0023 || 0.00031 || Yes (e.g. Zinc finger proteins)|| 12 
 |-  
 | 14 || Silicon || 0.002 || 0.0010|| 0.0058 || Yes (probable) || 14 
 |-  
 | 37 || Rubidium || 0.00046 || 0.00068|| 0.000033 || No (?) || 1  
 |-  
 | 38 || Strontium || 0.00046 || 0.00032|| 0.000033 || No (?) || 2 
 |-  
 | 35 || Bromine || 0.00029 || 0.00026|| 0.000030 || No (?) || 17 
 |-  
 | 82 || Lead || 0.00017 || 0.00012|| 0.0000045 || No (?) (toxic in higher amounts) || 14 
 |-  
 | 29 || Copper || 0.0001 || 0.000072|| 0.0000104 || Yes (e.g. copper proteins) || 11 
 |-  
 | 13 || Aluminium || 0.000087 || 0.000060|| 0.000015 || No(?) (toxic?) || 13 
 |-  
 | 48 || Cadmium || 0.000072 || 0.000050|| 0.0000045 || No(?) (toxic in higher amounts) || 12 
 |-  
 | 58 || Cerium || 0.000057 || 0.000040 || || No ||  
 |-  
 | 56 || Barium || 0.000031 || 0.000022|| 0.0000012 || No? (toxic) || 2 
 |-  
 | 50 || Tin || 0.000024 || 0.000020|| 6.0e-7 || No(?) || 14 
 |-  
 | 53 || Iodine || 0.000016 || 0.000020|| 7.5e-7 || Yes (e.g. thyroxine) || 17 
 |-  
 | 22 || Titanium || 0.000013 || 0.000020|| ||  No || 4 
 |-  
 | 5 || Boron || 0.000069 || 0.000018|| 0.0000030 || Yes (probable) || 13 
 |-  
 | 34 || Selenium || 0.000019 || 0.000015|| 4.5e-8 || Yes/No (toxic in higher amounts) || 16 
 |-  
 | 28 || Nickel || 0.000014 || 0.000015|| 0.0000015 || Yes (e.g. urease) || 10 
 |-  
 | 24 || [[Chromium