the human body

The human body contains, in descending order by weight, approximately 65% oxygen, 18% carbon, 10% hydrogen, 3% nitrogen, 2% calcium, 1.2% phosphorus, 0.2% potassium, 0.2% sulfur, 0.2% chlorine, 0.11% sodium, 0.04% magnesium, 0.04% iron, 0.00016% cobalt, 0.00015% copper, 0.00014% manganese, 0.00004% iodine, and trace amounts of zinc, boron, aluminum, vanadium, molybdenum, silicon, fluorine, chromium and selenium. Trace amounts of gold have also been found in toenails, even in those of newborns.