The life span of atomic hydrogen is:

Options

A. Fraction of one sec
B. One year
C. One hour
D. One day

Answer

To determine the lifespan of atomic hydrogen, we need to understand its properties and behavior in the atmosphere.

### Step-by-Step Solution:

1. **Understanding Atomic Hydrogen**: Atomic hydrogen refers to hydrogen atoms that are not bonded to other atoms, meaning they exist as individual H atoms. This form of hydrogen is highly reactive.

2. **Reactivity of Atomic Hydrogen**: Due to its single electron, atomic hydrogen is eager to bond with other atoms or molecules. In the presence of air or other gases, it quickly reacts to form diatomic hydrogen (H₂) or combines with other elements.

3. **Lifespan of Atomic Hydrogen**: Because atomic hydrogen reacts so rapidly with other substances, its lifespan is extremely short. It does not remain in its atomic form for long periods.

4. **Conclusion**: The lifespan of atomic hydrogen is less than one second. It is typically measured in fractions of a second due to its high reactivity.

5. **Final Answer**: Therefore, the lifespan of atomic hydrogen is a fraction of one second.