Which is true regarding nitrogen ?

Options

A. Less electronegativity
B. Has low ionisation enthalpy
C. d-orbitals are available
D. Ability to form `p pi - p pi` bonds with itself

Explanation

To determine which statement is true regarding nitrogen, let's analyze each option step by step.

### Step 1: Analyze the first option
**Statement:** Nitrogen has less electronegativity.

**Analysis:**
- Electronegativity is a measure of an atom's ability to attract and hold onto electrons.
- The electronegativity values according to the Pauling scale are:
- Fluorine (highest), followed by Oxygen, and then Nitrogen.
- Therefore, nitrogen has a relatively high electronegativity compared to many other elements.

**Conclusion:** This statement is **incorrect**.

### Step 2: Analyze the second option
**Statement:** Nitrogen has low ionization enthalpy.

**Analysis:**
- Ionization enthalpy (or ionization energy) is the energy required to remove an electron from an atom.
- The electronic configuration of nitrogen is 1s² 2s² 2p³. The presence of half-filled p orbitals (2p³) provides extra stability, making it harder to remove an electron.
- As a result, nitrogen has a relatively high ionization energy.

**Conclusion:** This statement is **incorrect**.

### Step 3: Analyze the third option
**Statement:** Nitrogen has available orbitals.

**Analysis:**
- The electronic configuration of nitrogen shows that it has a filled 1s orbital and a filled 2s orbital, with three electrons in the 2p orbital (2p³).
- While nitrogen does have p orbitals, the statement implies that it has available orbitals for bonding in a way that is misleading. The half-filled nature of the p orbitals does not mean that they are "available" in the sense of forming additional bonds easily.

**Conclusion:** This statement is **incorrect**.

### Step 4: Analyze the fourth option
**Statement:** Nitrogen has the ability to form p pi p pi bonds with itself.

**Analysis:**
- Nitrogen can indeed form p pi p pi bonds due to its small atomic size and high electronegativity.
- This allows nitrogen atoms to overlap their p orbitals effectively, leading to the formation of triple bonds (as seen in molecular nitrogen, N₂).
- This ability to form multiple bonds is a characteristic feature of nitrogen.

**Conclusion:** This statement is **correct**.

### Final Answer:
The true statement regarding nitrogen is: **Ability to form p pi p pi bonds with itself.**

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