Which of the following has maximum density?

Options

A. Fe
B. Cu
C. B
D. Pb

Explanation

To determine which of the given elements has the maximum density, we will analyze the density of each element listed: ferrous (iron), copper, boron, and lead.

### Step-by-Step Solution:

1. **Identify the Elements and Their Atomic Numbers**:
- Ferrous (Iron) - Atomic Number: 26
- Copper - Atomic Number: 29
- Boron - Atomic Number: 5
- Lead - Atomic Number: 82

2. **Understanding Density**:
- Density is defined as mass per unit volume. Generally, elements with higher atomic numbers tend to have higher densities due to the greater number of protons and neutrons, which contribute to the mass.

3. **Comparing Atomic Numbers**:
- The atomic numbers of the elements indicate the number of protons in the nucleus and, in a neutral atom, the number of electrons.
- Higher atomic numbers generally suggest a greater mass.

4. **Density Values of the Elements**:
- Now, we need to look up or recall the approximate densities of these elements:
- Ferrous (Iron): ~7.87 g/cm³
- Copper: ~8.96 g/cm³
- Boron: ~2.34 g/cm³
- Lead: ~11.34 g/cm³

5. **Conclusion**:
- Comparing the densities:
- Iron: 7.87 g/cm³
- Copper: 8.96 g/cm³
- Boron: 2.34 g/cm³
- Lead: 11.34 g/cm³
- Lead has the highest density among the four elements.

### Final Answer:
The element with the maximum density is **Lead**.

---