McqMate
| Q. |
The most abundant element in the human body is – |
| A. | carbon |
| B. | iron |
| C. | nitrogen |
| D. | oxygen |
| Answer» D. oxygen | |
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Explanation: The composition of the human body can be looked at from the point of view of either mass composition, or atomic composition. To illustrate both views, the human body is 70% water, and water is 11% hydrogen by mass but 67% hydrogen by 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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