In which of the following metallic bond is strongest

Options

A. Fe
B. Sc
C. V
D. Cr

Explanation

To determine which metallic bond is the strongest among the given options, we need to analyze the number of unpaired electrons in each element. The strength of metallic bonds is directly proportional to the number of unpaired electrons.

Let's analyze each element step by step:

### Step 1: Analyze Iron (Fe)
- Electron configuration: \(4s^2 3d^6\)
- Unpaired electrons in 3d:
- The 3d subshell can hold a maximum of 10 electrons.
- In the case of \(3d^6\), the distribution of electrons would be:
- 3d: ↑↑↑↑↑↑ (6 electrons)
- There are 4 unpaired electrons in the 3d subshell.

**Unpaired Electrons in Iron: 4**

### Step 2: Analyze Scandium (Sc)
- Electron configuration: \(4s^2 3d^1\)
- Unpaired electrons in 3d:
- In the case of \(3d^1\), the distribution of electrons would be:
- 3d: ↑ (1 electron)
- There is 1 unpaired electron in the 3d subshell.

**Unpaired Electrons in Scandium: 1**

### Step 3: Analyze Vanadium (V)
- Electron configuration: \(4s^2 3d^3\)
- Unpaired electrons in 3d:
- In the case of \(3d^3\), the distribution of electrons would be:
- 3d: ↑↑↑ (3 electrons)
- There are 3 unpaired electrons in the 3d subshell.

**Unpaired Electrons in Vanadium: 3**

### Step 4: Analyze Chromium (Cr)
- Electron configuration: \(4s^2 3d^5\) (or \(4s^1 3d^5\) due to half-filled stability)
- Unpaired electrons in 3d:
- In the case of \(3d^5\), the distribution of electrons would be:
- 3d: ↑↑↑↑↑ (5 electrons)
- There are 5 unpaired electrons in the 3d subshell.

**Unpaired Electrons in Chromium: 5**

### Step 5: Compare the Number of Unpaired Electrons
- Iron: 4 unpaired electrons
- Scandium: 1 unpaired electron
- Vanadium: 3 unpaired electrons
- Chromium: 5 unpaired electrons

### Conclusion
The element with the highest number of unpaired electrons is Chromium (Cr) with 5 unpaired electrons. Therefore, the metallic bond in Chromium is the strongest among the given options.

### Final Answer
**Chromium (Cr) has the strongest metallic bond.**

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