The transition element with highest density among the following is

Options

A. Sc
B. Fe
C. Zn
D. Cu

Answer

To determine the transition element with the highest density among the given options (Sc, Fe, Zn, Cu), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Elements and Their Atomic Numbers**:
- Scandium (Sc) - Atomic Number: 21
- Iron (Fe) - Atomic Number: 26
- Zinc (Zn) - Atomic Number: 30
- Copper (Cu) - Atomic Number: 29

2. **Understanding Density**:
- Density is defined as mass per unit volume (Density = Mass/Volume).
- In the context of transition metals, density is influenced by both atomic mass and atomic size.

3. **Relate Atomic Size to Density**:
- As we move across a period in the periodic table, atomic size generally decreases due to increased nuclear charge, which pulls electrons closer to the nucleus.
- A smaller atomic size typically leads to a higher density, assuming mass increases.

4. **Consider Atomic Mass**:
- As atomic number increases, atomic mass tends to increase as well. Higher mass can contribute to higher density.

5. **Compare the Elements**:
- Based on atomic numbers, we can arrange the elements in order:
- Sc < Fe < Cu < Zn
- As atomic number increases, we expect density to increase as well.

6. **Conclusion**:
- Among the given elements, Zinc (Zn) has the highest atomic number (30) and therefore is expected to have the highest density.

### Final Answer:
The transition element with the highest density among the given options is **Zinc (Zn)**.