Which of the following statements is not correct about hydrogen?

Options

A. Its molecule is diatomic
B. It shows a dual nature as exhibits simility with both alkali metals and halogens.
C. It is not abundantly found in free state in nature.
D. It has 2 electrons in its valence shell and so its valency is 2.

Explanation

To determine which statement is not correct about hydrogen, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Statements**: We need to evaluate the following statements about hydrogen:
- Statement 1: Hydrogen molecule is diatomic (H2).
- Statement 2: Hydrogen shows dual nature, exhibiting similarities with both alkali metals and halogens.
- Statement 3: Hydrogen is not abundantly found in free state in nature.
- Statement 4: Hydrogen has two electrons in its valence shell, and so its valency is 2.

2. **Evaluate Statement 1**:
- Hydrogen exists as a diatomic molecule (H2), which means it consists of two hydrogen atoms.
- This statement is correct.

**Hint**: Recall that diatomic means a molecule composed of two atoms.

3. **Evaluate Statement 2**:
- Hydrogen has one electron, similar to alkali metals, which also have one valence electron.
- It can gain one electron to achieve the electronic configuration of helium, similar to halogens which also gain one electron to achieve a stable configuration.
- Therefore, hydrogen does exhibit dual nature, showing properties of both alkali metals and halogens.
- This statement is correct.

**Hint**: Consider the valence electrons of hydrogen compared to alkali metals and halogens.

4. **Evaluate Statement 3**:
- Hydrogen is highly reactive due to its tendency to gain an electron to achieve a stable electronic configuration.
- As a result, it is not commonly found in its free state in nature.
- This statement is also correct.

**Hint**: Think about the reactivity of hydrogen and its tendency to form compounds.

5. **Evaluate Statement 4**:
- Hydrogen has only one electron in its valence shell, not two.
- Therefore, its valency is 1, as it can gain one electron to achieve stability.
- This statement is incorrect.

**Hint**: Remember the definition of valence electrons and how they relate to an element's valency.

6. **Conclusion**:
- The statement that is not correct about hydrogen is **Statement 4**: "Hydrogen has two electrons in its valence shell, and so its valency is 2."

### Final Answer:
**The incorrect statement about hydrogen is Statement 4.**

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