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The human body is about 70% water which is H2O, so most of the atoms are hydrogen. But hydrogen atoms are very light, so by weight, most of the atoms are oxygen. By weight, the human body is 65% oxygen, 18% carbon, 10% hydrogen, 3% nitrogen, 1.5% calcium and 1.2% phosphorus. Those 6 elements account for over 98% of all the atoms in a human body.

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16y ago

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