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How many atoms are in our body?

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In summary, for a typical human of 70 kg, there are almost 7*1027 atoms (that's a 7 followed by 27 zeros!) Another way of saying this is "seven billion billion billion." Of this, almost 2/3 is hydrogen, 1/4 is oxygen, and about 1/10 is carbon. These three atoms add up to 99% of the total! read more

On average, 87% of the atoms in the body are hydrogen or oxygen. Carbon, hydrogen, nitrogen, and oxygen together account for 99% of the atoms in a person. There are 41 chemical elements found in most people. The exact number of atoms of the trace elements varies widely according to age, diet, and environmental factors. read more

Be sure to keep in mind that the following numbers are based on the number of atoms, not percent of body weight (by weight we are mostly oxygen). A 70 kg body would have approximately 7*10 27 atoms. That is, 7 followed by 27 zeros: 7,000,000,000,000,000,000,000,000,000. Of that, 4.7*10 27 would be hydrogen atoms, which have one proton and one electron each. read more

The estimate of seven billion billion billion atoms per human body was made for a person who weighs 70 kg (154 lbs), so your results may vary! 99% of these atoms would be hydrogen, oxygen, and carbon—the rest are trace elements. And let's not forget, the vast majority of these atoms came from stars that exploded billions of years ago. read more

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