Nitrogen is

Options

A. Non-metal element
B. Mineral element
C. Non-metal element
D. All the above.

Answer

To answer the question "Nitrogen is," we will analyze the options provided and determine the correct classification of nitrogen.

### Step-by-Step Solution:

1. **Identify the Nature of Nitrogen**:
- Nitrogen is a chemical element with the symbol N and atomic number 7. It is a colorless, odorless gas at room temperature.

2. **Evaluate the Options**:
- **Option 1: Non-mineral element**: This option suggests that nitrogen does not fall under the category of minerals. However, nitrogen is essential for life and is found in various forms in nature, including as a mineral in the soil.
- **Option 2: Mineral element**: This option suggests that nitrogen is a mineral. While nitrogen itself is not a mineral in the traditional sense (like quartz or calcite), it is often classified as a mineral nutrient essential for plant growth.
- **Option 3: Non-metal element**: Nitrogen is indeed a non-metal. It is a gas at room temperature and does not exhibit metallic properties.
- **Option 4: All of the above**: This option suggests that nitrogen can be classified as a non-mineral, mineral, and non-metal element simultaneously.

3. **Determine the Correct Answer**:
- Considering the definitions and characteristics of nitrogen, we can conclude that:
- It is a non-metal (Option 3).
- It is often considered a mineral nutrient for plants (Option 2).
- However, it cannot be classified strictly as a non-mineral element (Option 1).
- Therefore, the most accurate classification of nitrogen is that it is a **non-metal element** and also considered a **mineral element** in the context of its role in biological systems.

4. **Final Conclusion**:
- The best answer to the question "Nitrogen is" would be **Option 3: Non-metal element**. However, if we consider its role in biological systems, **Option 2: Mineral element** can also be argued, but it is not a mineral in the strictest sense.

### Final Answer:
Nitrogen is a non-metal element (Option 3).