Which of these is the most abundant elelment in the universe?

Options

A. Hydrogen
B. Nitrogen
C. Oxygen
D. Carbon

Answer

**Step-by-Step Solution:**

1. **Identify the Elements in Question**: The question asks for the most abundant element in the universe. We need to consider the common elements found in the universe, such as Hydrogen, Nitrogen, Oxygen, and Carbon.

2. **Research the Abundance of Each Element**:
- **Hydrogen**: It is known that Hydrogen is the most abundant element in the universe, constituting about 74% of the universe's elemental mass.
- **Nitrogen**: Nitrogen is primarily abundant in the Earth's atmosphere but only makes up about 0.1% of the universe.
- **Oxygen**: Oxygen accounts for approximately 1% of the universe.
- **Carbon**: Carbon is present at about 0.5% in the universe.

3. **Compare the Percentages**:
- Hydrogen: 74%
- Nitrogen: 0.1%
- Oxygen: 1%
- Carbon: 0.5%

4. **Determine the Most Abundant Element**: Based on the percentages, Hydrogen is significantly more abundant than the other elements listed.

5. **Conclusion**: Therefore, the most abundant element in the universe is Hydrogen.

**Final Answer**: Hydrogen is the most abundant element in the universe.

---