Elements are composed of chemical substances which are distinguished by their atomic number. In total there are 117 elements out of which 94 occur naturally on Earth. Human body is made up of different chemical elements. These elements are needed for several chemical reactions in the body to produce energy. There are several metabolisms which require these elements in different organs of human body.
| No. | Elements | Average Weight (Grams) | Average Weight (Oz) |
| 1. | Oxygen | 45,500 | 1,608 |
| 2. | Carbon | 12,600 | 445 |
| 3. | Hydrogen | 7,000 | 247 |
| 4. | Nitrogen | 2,100 | 74 |
| 5. | Calcium | 1,050 | 37 |
| 6. | Phosphorus | 700 | 25 |
| 7. | Sulphur | 175 | 6 |
| 8. | Potassium | 140 | 5 |
| 9. | Chlorine | 105 | 4 |
| 10. | Sodium | 105 | 4 |
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