How many of the following elements have a greater percentage weight in the human body than percentage weight in in the earth crust ?
( Sulphur, sodium, oxygen, Nitrogen, carbon, Hydrogen, Megnesium, silicon, and calcium )

Options

A. 3
B. 5
C. 6
D. 7

Answer

To determine how many of the listed elements have a greater percentage weight in the human body compared to their percentage weight in the Earth's crust, we will analyze each element one by one.

1. **Sulphur (S)**:
- Percentage in Earth's crust: 0.03%
- Percentage in human body: 0.3%
- Conclusion: Sulphur is greater in the human body.

2. **Sodium (Na)**:
- Percentage in Earth's crust: 2.8%
- Percentage in human body: 0.2%
- Conclusion: Sodium is greater in the Earth's crust.

3. **Oxygen (O)**:
- Percentage in Earth's crust: 46.6%
- Percentage in human body: 65%
- Conclusion: Oxygen is greater in the human body.

4. **Nitrogen (N)**:
- Percentage in Earth's crust: 0.002%
- Percentage in human body: 3.3%
- Conclusion: Nitrogen is greater in the human body.

5. **Carbon (C)**:
- Percentage in Earth's crust: 0.3%
- Percentage in human body: 18.5%
- Conclusion: Carbon is greater in the human body.

6. **Hydrogen (H)**:
- Percentage in Earth's crust: 0.14%
- Percentage in human body: 0.5%
- Conclusion: Hydrogen is greater in the human body.

7. **Magnesium (Mg)**:
- Percentage in Earth's crust: 2.1%
- Percentage in human body: 0.1%
- Conclusion: Magnesium is greater in the Earth's crust.

8. **Silicon (Si)**:
- Percentage in Earth's crust: 27.7%
- Percentage in human body: 0%
- Conclusion: Silicon is greater in the Earth's crust.

9. **Calcium (Ca)**:
- Percentage in Earth's crust: 3.6%
- Percentage in human body: 1.5%
- Conclusion: Calcium is greater in the Earth's crust.

Now, let's summarize the findings:
- Elements that are greater in the human body: Sulphur, Oxygen, Nitrogen, Carbon, and Hydrogen.
- Elements that are greater in the Earth's crust: Sodium, Magnesium, Silicon, and Calcium.

**Final Count**:
There are 5 elements (Sulphur, Oxygen, Nitrogen, Carbon, and Hydrogen) that have a greater percentage weight in the human body than in the Earth's crust.

**Answer**: 5