Multiple choice

Most abundant element by atomic percent in human body is ______

  1. C

  2. O

  3. H

  4. N

  5. P
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This option is correct because in an adult male human body water is approximately 57%. The water is 11% hydrogen by mass but 67% by count of atoms (i.e. 67 atomic percent). Thus, most of the mass of the human body is oxygen, but most of the atoms in the human body are hydrogen atoms.

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