What are the top ten most abundant elements in the human body?

Answer : The majority of the substances that make up the human body can be found in nature. The top ten elements in the human body by mass % are listed below:

1. Oxygen (O) – 65%
2. Carbon (C) – 18%
3. Hydrogen (H) – 10%
4. Calcium (Ca) – 1.5%
5. Nitrogen (N) – 3%
6. Potassium (K) – 0.25%
7. Phosphorus (P) – 1%
8. Sodium (Na) – 0.15%
9. Sulfur (S) – 0.25%
10. Chlorine (Cl) – 0.15%

These ten substances collectively account for 99% of the bulk of the human body. Magnesium, iron, zinc, copper, iodine, and many more elements are also present although in smaller concentrations.