Why does `H^(+)` ion always get associated with atoms or molecules ?

Options

A. Ionisation enthalpy of hydrogen resembles that of alkali metals.
B. Its reactivity is similar to halogens
C. It resembles both alkali metals and holgens
D. Loss of an electron form hydrogen atom results in a nucleus of very small sizes as compared to other atoms or ions. Due to small size it cannot exist free.

Explanation

To answer the question "Why does the \( H^+ \) ion always get associated with atoms or molecules?", we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding the Hydrogen Atom**:
- A hydrogen atom consists of one proton in its nucleus and one electron in its 1s orbital. Its electronic configuration is \( 1s^1 \).

2. **Formation of \( H^+ \) Ion**:
- When a hydrogen atom loses its single electron, it becomes a \( H^+ \) ion. This process can be represented as:
\[ H \rightarrow H^+ + e^- \]

3. **Characteristics of \( H^+ \)**:
- The \( H^+ \) ion is essentially just a proton, as it has lost its only electron. This means that \( H^+ \) has a very small size because it consists only of a single proton.

4. **Stability of \( H^+ \)**:
- Due to its small size and the absence of electrons, the \( H^+ \) ion is highly reactive and unstable when isolated. It cannot exist freely in nature.

5. **Association with Atoms or Molecules**:
- To achieve stability, the \( H^+ \) ion tends to associate with other atoms or molecules. This association typically occurs through ionic or covalent bonding, where \( H^+ \) can attract electrons from other atoms or molecules to form stable compounds.

6. **Conclusion**:
- Therefore, the \( H^+ \) ion always gets associated with atoms or molecules because its very small size and lack of electrons make it unstable in isolation.