<Table> <Tr> <Th> Atomic number </Th> <Th> Element </Th> <Th> Fraction of mass </Th> <Th> Mass ( kg ) </Th> <Th> Atomic percent </Th> <Th> Essential in humans </Th> <Th> Negative effects of excess </Th> <Th> Group </Th> </Tr> <Tr> <Td> 8 </Td> <Td> Oxygen </Td> <Td> 0.65 </Td> <Td> 43 </Td> <Td> 24 </Td> <Td> Yes ( e.g. water , electron acceptor ) </Td> <Td> Reactive oxygen species </Td> <Td> 16 </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Carbon </Td> <Td> 0.18 </Td> <Td> 16 </Td> <Td> 12 </Td> <Td> Yes ( organic compounds ) </Td> <Td> </Td> <Td> 14 </Td> </Tr> <Tr> <Td> </Td> <Td> Hydrogen </Td> <Td> 0.10 </Td> <Td> 7 </Td> <Td> 62 </Td> <Td> Yes ( e.g. water ) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 7 </Td> <Td> Nitrogen </Td> <Td> 0.03 </Td> <Td> 1.8 </Td> <Td> 1.1 </Td> <Td> Yes ( e.g. DNA and amino acids ) </Td> <Td> </Td> <Td> 15 </Td> </Tr> <Tr> <Td> 20 </Td> <Td> Calcium </Td> <Td> 0.014 </Td> <Td> 1.0 </Td> <Td> 0.22 </Td> <Td> Yes ( e.g. Calmodulin and Hydroxylapatite in bones ) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 15 </Td> <Td> Phosphorus </Td> <Td> 0.011 </Td> <Td> 0.78 </Td> <Td> 0.22 </Td> <Td> Yes ( e.g. DNA and phosphorylation ) </Td> <Td> white allotrope highly toxic </Td> <Td> 15 </Td> </Tr> <Tr> <Td> 19 </Td> <Td> Potassium </Td> <Td> 6997200000000000000 ♠ 2.0 × 10 </Td> <Td> 0.14 </Td> <Td> 0.033 </Td> <Td> Yes ( e.g. Na / K - ATPase ) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 16 </Td> <Td> Sulfur </Td> <Td> 6997250000000000000 ♠ 2.5 × 10 </Td> <Td> 0.14 </Td> <Td> 0.038 </Td> <Td> Yes ( e.g. Cysteine , Methionine , Biotin , Thiamine ) </Td> <Td> </Td> <Td> 16 </Td> </Tr> <Tr> <Td> 11 </Td> <Td> Sodium </Td> <Td> 6997150000000000000 ♠ 1.5 × 10 </Td> <Td> 0.10 </Td> <Td> 0.037 </Td> <Td> Yes ( e.g. Na / K - ATPase ) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 17 </Td> <Td> Chlorine </Td> <Td> 6997150000000000000 ♠ 1.5 × 10 </Td> <Td> 0.095 </Td> <Td> 0.024 </Td> <Td> Yes ( e.g. Cl - transporting ATPase ) </Td> <Td> </Td> <Td> 17 </Td> </Tr> <Tr> <Td> 12 </Td> <Td> Magnesium </Td> <Td> 6996500000000000000 ♠ 500 × 10 </Td> <Td> 0.019 </Td> <Td> 0.0070 </Td> <Td> Yes ( e.g. binding to ATP and other nucleotides ) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 26 </Td> <Td> Iron * </Td> <Td> 6995600000000000000 ♠ 60 × 10 </Td> <Td> 0.0042 </Td> <Td> 0.00067 </Td> <Td> Yes ( e.g. Hemoglobin , Cytochromes ) </Td> <Td> </Td> <Td> 8 </Td> </Tr> <Tr> <Td> 9 </Td> <Td> Fluorine </Td> <Td> 6995370000000000000 ♠ 37 × 10 </Td> <Td> 0.0026 </Td> <Td> 0.0012 </Td> <Td> Yes ( AUS , NZ ) , No ( US , EU ) , Maybe ( WHO ) </Td> <Td> toxic in high amounts </Td> <Td> 17 </Td> </Tr> <Tr> <Td> 30 </Td> <Td> Zinc </Td> <Td> 6995320000000000000 ♠ 32 × 10 </Td> <Td> 0.0023 </Td> <Td> 0.00031 </Td> <Td> Yes ( e.g. Zinc finger proteins ) </Td> <Td> </Td> <Td> 12 </Td> </Tr> <Tr> <Td> 14 </Td> <Td> Silicon </Td> <Td> 6995199999999999999 ♠ 20 × 10 </Td> <Td> 0.0010 </Td> <Td> 0.0058 </Td> <Td> Possibly </Td> <Td> </Td> <Td> 14 </Td> </Tr> <Tr> <Td> 37 </Td> <Td> Rubidium </Td> <Td> 6994459999999999999 ♠ 4.6 × 10 </Td> <Td> 0.00068 </Td> <Td> 0.000033 </Td> <Td> No </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 38 </Td> <Td> Strontium </Td> <Td> 6994459999999999999 ♠ 4.6 × 10 </Td> <Td> 0.00032 </Td> <Td> 0.000033 </Td> <Td> -- -- </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 35 </Td> <Td> Bromine </Td> <Td> 6994290000000000000 ♠ 2.9 × 10 </Td> <Td> 0.00026 </Td> <Td> 0.000030 </Td> <Td> -- -- </Td> <Td> </Td> <Td> 17 </Td> </Tr> <Tr> <Td> 82 </Td> <Td> Lead </Td> <Td> 6994169999999999999 ♠ 1.7 × 10 </Td> <Td> 0.00012 </Td> <Td> 0.0000045 </Td> <Td> No </Td> <Td> toxic </Td> <Td> 14 </Td> </Tr> <Tr> <Td> 29 </Td> <Td> Copper </Td> <Td> 6994100000000000000 ♠ 1 × 10 </Td> <Td> 0.000072 </Td> <Td> 0.0000104 </Td> <Td> Yes ( e.g. copper proteins ) </Td> <Td> </Td> <Td> 11 </Td> </Tr> <Tr> <Td> 13 </Td> <Td> Aluminium </Td> <Td> 6993870000000000000 ♠ 870 × 10 </Td> <Td> 0.000060 </Td> <Td> 0.000015 </Td> <Td> No </Td> <Td> </Td> <Td> 13 </Td> </Tr> <Tr> <Td> 48 </Td> <Td> Cadmium </Td> <Td> 6993720000000000000 ♠ 720 × 10 </Td> <Td> 0.000050 </Td> <Td> 0.0000045 </Td> <Td> No </Td> <Td> toxic </Td> <Td> 12 </Td> </Tr> <Tr> <Td> 58 </Td> <Td> Cerium </Td> <Td> 6993570000000000000 ♠ 570 × 10 </Td> <Td> 0.000040 </Td> <Td> </Td> <Td> No </Td> <Td> </Td> <Td> </Td> </Tr>
<Table> <Tr> <Th> Atomic number </Th> <Th> Element </Th> <Th> Fraction of mass </Th> <Th> Mass ( kg ) </Th> <Th> Atomic percent </Th> <Th> Essential in humans </Th> <Th> Negative effects of excess </Th> <Th> Group </Th> </Tr> <Tr> <Td> 8 </Td> <Td> Oxygen </Td> <Td> 0.65 </Td> <Td> 43 </Td> <Td> 24 </Td> <Td> Yes ( e.g. water , electron acceptor ) </Td> <Td> Reactive oxygen species </Td> <Td> 16 </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Carbon </Td> <Td> 0.18 </Td> <Td> 16 </Td> <Td> 12 </Td> <Td> Yes ( organic compounds ) </Td> <Td> </Td> <Td> 14 </Td> </Tr> <Tr> <Td> </Td> <Td> Hydrogen </Td> <Td> 0.10 </Td> <Td> 7 </Td> <Td> 62 </Td> <Td> Yes ( e.g. water ) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 7 </Td> <Td> Nitrogen </Td> <Td> 0.03 </Td> <Td> 1.8 </Td> <Td> 1.1 </Td> <Td> Yes ( e.g. DNA and amino acids ) </Td> <Td> </Td> <Td> 15 </Td> </Tr> <Tr> <Td> 20 </Td> <Td> Calcium </Td> <Td> 0.014 </Td> <Td> 1.0 </Td> <Td> 0.22 </Td> <Td> Yes ( e.g. Calmodulin and Hydroxylapatite in bones ) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 15 </Td> <Td> Phosphorus </Td> <Td> 0.011 </Td> <Td> 0.78 </Td> <Td> 0.22 </Td> <Td> Yes ( e.g. DNA and phosphorylation ) </Td> <Td> white allotrope highly toxic </Td> <Td> 15 </Td> </Tr> <Tr> <Td> 19 </Td> <Td> Potassium </Td> <Td> 6997200000000000000 ♠ 2.0 × 10 </Td> <Td> 0.14 </Td> <Td> 0.033 </Td> <Td> Yes ( e.g. Na / K - ATPase ) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 16 </Td> <Td> Sulfur </Td> <Td> 6997250000000000000 ♠ 2.5 × 10 </Td> <Td> 0.14 </Td> <Td> 0.038 </Td> <Td> Yes ( e.g. Cysteine , Methionine , Biotin , Thiamine ) </Td> <Td> </Td> <Td> 16 </Td> </Tr> <Tr> <Td> 11 </Td> <Td> Sodium </Td> <Td> 6997150000000000000 ♠ 1.5 × 10 </Td> <Td> 0.10 </Td> <Td> 0.037 </Td> <Td> Yes ( e.g. Na / K - ATPase ) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 17 </Td> <Td> Chlorine </Td> <Td> 6997150000000000000 ♠ 1.5 × 10 </Td> <Td> 0.095 </Td> <Td> 0.024 </Td> <Td> Yes ( e.g. Cl - transporting ATPase ) </Td> <Td> </Td> <Td> 17 </Td> </Tr> <Tr> <Td> 12 </Td> <Td> Magnesium </Td> <Td> 6996500000000000000 ♠ 500 × 10 </Td> <Td> 0.019 </Td> <Td> 0.0070 </Td> <Td> Yes ( e.g. binding to ATP and other nucleotides ) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 26 </Td> <Td> Iron * </Td> <Td> 6995600000000000000 ♠ 60 × 10 </Td> <Td> 0.0042 </Td> <Td> 0.00067 </Td> <Td> Yes ( e.g. Hemoglobin , Cytochromes ) </Td> <Td> </Td> <Td> 8 </Td> </Tr> <Tr> <Td> 9 </Td> <Td> Fluorine </Td> <Td> 6995370000000000000 ♠ 37 × 10 </Td> <Td> 0.0026 </Td> <Td> 0.0012 </Td> <Td> Yes ( AUS , NZ ) , No ( US , EU ) , Maybe ( WHO ) </Td> <Td> toxic in high amounts </Td> <Td> 17 </Td> </Tr> <Tr> <Td> 30 </Td> <Td> Zinc </Td> <Td> 6995320000000000000 ♠ 32 × 10 </Td> <Td> 0.0023 </Td> <Td> 0.00031 </Td> <Td> Yes ( e.g. Zinc finger proteins ) </Td> <Td> </Td> <Td> 12 </Td> </Tr> <Tr> <Td> 14 </Td> <Td> Silicon </Td> <Td> 6995199999999999999 ♠ 20 × 10 </Td> <Td> 0.0010 </Td> <Td> 0.0058 </Td> <Td> Possibly </Td> <Td> </Td> <Td> 14 </Td> </Tr> <Tr> <Td> 37 </Td> <Td> Rubidium </Td> <Td> 6994459999999999999 ♠ 4.6 × 10 </Td> <Td> 0.00068 </Td> <Td> 0.000033 </Td> <Td> No </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 38 </Td> <Td> Strontium </Td> <Td> 6994459999999999999 ♠ 4.6 × 10 </Td> <Td> 0.00032 </Td> <Td> 0.000033 </Td> <Td> -- -- </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 35 </Td> <Td> Bromine </Td> <Td> 6994290000000000000 ♠ 2.9 × 10 </Td> <Td> 0.00026 </Td> <Td> 0.000030 </Td> <Td> -- -- </Td> <Td> </Td> <Td> 17 </Td> </Tr> <Tr> <Td> 82 </Td> <Td> Lead </Td> <Td> 6994169999999999999 ♠ 1.7 × 10 </Td> <Td> 0.00012 </Td> <Td> 0.0000045 </Td> <Td> No </Td> <Td> toxic </Td> <Td> 14 </Td> </Tr> <Tr> <Td> 29 </Td> <Td> Copper </Td> <Td> 6994100000000000000 ♠ 1 × 10 </Td> <Td> 0.000072 </Td> <Td> 0.0000104 </Td> <Td> Yes ( e.g. copper proteins ) </Td> <Td> </Td> <Td> 11 </Td> </Tr> <Tr> <Td> 13 </Td> <Td> Aluminium </Td> <Td> 6993870000000000000 ♠ 870 × 10 </Td> <Td> 0.000060 </Td> <Td> 0.000015 </Td> <Td> No </Td> <Td> </Td> <Td> 13 </Td> </Tr> <Tr> <Td> 48 </Td> <Td> Cadmium </Td> <Td> 6993720000000000000 ♠ 720 × 10 </Td> <Td> 0.000050 </Td> <Td> 0.0000045 </Td> <Td> No </Td> <Td> toxic </Td> <Td> 12 </Td> </Tr> <Tr> <Td> 58 </Td> <Td> Cerium </Td> <Td> 6993570000000000000 ♠ 570 × 10 </Td> <Td> 0.000040 </Td> <Td> </Td> <Td> No </Td> <Td> </Td> <Td> </Td> </Tr>
the element which is the most abundant in the human body is
the element which is the most abundant in the human body is
Oxygen
Oxygen