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Short Answer:

There are 60 elements normally detectable in the human body with two dozen known to be either essential or beneficial.

Four, however, H,C, O and N, make up the majority of our atoms and molecules.

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.

Nitrogen is 3% of our mass and only .58% of our atoms.

Together, H+C+O+N, account for 63+24+12=99.5% of the atoms and 65+18+10+3=96% of our mass. One has to add in calcium + phosphorus + potassium + sulfur(=1.4%+1.1%+.25%+.25%) to get 4% to account for 99% of our mass.

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