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Short Answer:

There are 60 types of elements normally detectable in the human body with two dozen known to be either essential or beneficial. Three, however, H,C, and O,

make up the majority of our atoms.

Long Answer:

Hydrogen represents 63% of the atoms in our body but only 10% of our mass.

Oxygen is almost 2/3 rds (65%) of our mass but only 12% of our atoms.

Carbon is 1/8th (12%) of the atoms and 18% of the mass.

Together, H+C+O, account for 63+24+12=99% of the atoms and 65+18+10=93% of our mass.

One has to add in nitrogen + calcium + phosphorus + potassium + sulfur (=3%+1.4%+1.1%+.25%+.25%) to get 7% more and account for 99% of our mass.

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