Which of the following transitional metal has lowest boiling point (B.P.)

Options

A. Zn
B. Sc
C. Ti
D. V

Explanation

To determine which of the following transition metals has the lowest boiling point, we will analyze the boiling points of the given metals: Zinc (Zn), Scandium (Sc), Titanium (Ti), and Molybdenum (Mo).

### Step-by-Step Solution:

1. **Define Boiling Point**:
The boiling point is the temperature at which the vapor pressure of a liquid equals the atmospheric pressure. In the context of metals, it indicates the temperature at which the metal transitions from a solid to a gaseous state.

**Hint**: Remember that boiling point is influenced by the strength of metallic bonds in the solid state.

2. **Identify the Metals**:
The metals in question are Zinc (Zn), Scandium (Sc), Titanium (Ti), and Molybdenum (Mo).

**Hint**: Familiarize yourself with the position of these metals in the periodic table and their electronic configurations.

3. **Analyze Electronic Configurations**:
- **Zinc (Zn)**: [Ar] 4s² 3d¹⁰ (completely filled)
- **Scandium (Sc)**: [Ar] 4s² 3d¹ (one unpaired electron)
- **Titanium (Ti)**: [Ar] 4s² 3d² (two unpaired electrons)
- **Molybdenum (Mo)**: [Kr] 5s² 4d⁵ (five unpaired electrons)

**Hint**: Metals with unpaired electrons typically have stronger metallic bonding due to the presence of more available electrons for bonding.

4. **Compare the Metallic Bonding**:
- Zinc has a completely filled d-subshell (3d¹⁰) and no unpaired electrons, which results in weaker metallic bonding compared to the others.
- Scandium, Titanium, and Molybdenum have unpaired electrons, leading to stronger metallic bonds and higher boiling points.

**Hint**: The presence of unpaired electrons generally increases the strength of metallic bonds, leading to higher boiling points.

5. **Conclusion**:
Based on the analysis, Zinc (Zn) has the lowest boiling point among the given transition metals due to its lack of unpaired electrons and weaker metallic bonding.

**Final Answer**: Zinc (Zn) has the lowest boiling point.