What is the correct order of the following elements with respect to their density ?

Options

A. Cr `lt` Zn `lt` Co `lt` Cu `lt` Fe
B. Zn `lt` Cu `lt` Co `lt` Fe `lt` Cr
C. Zn `lt` Cr `lt` Fe `lt` Co `lt` Cu
D. Cr `lt` Fe `lt` Co `lt` Cu `lt` Zn

Answer

To determine the correct order of the given elements with respect to their density, we will analyze the densities of each element in the 3D transition series. The elements we need to consider are:

1. Scandium (Sc)
2. Titanium (Ti)
3. Vanadium (V)
4. Chromium (Cr)
5. Manganese (Mn)
6. Iron (Fe)
7. Cobalt (Co)
8. Nickel (Ni)
9. Copper (Cu)
10. Zinc (Zn)

### Step-by-Step Solution:

1. **List the Elements**: Write down the elements in the 3D transition series.
- Scandium (Sc)
- Titanium (Ti)
- Vanadium (V)
- Chromium (Cr)
- Manganese (Mn)
- Iron (Fe)
- Cobalt (Co)
- Nickel (Ni)
- Copper (Cu)
- Zinc (Zn)

2. **Find the Densities**: Look up the densities of each of these elements.
- Scandium (Sc): 2.98 g/cm³
- Titanium (Ti): 4.51 g/cm³
- Vanadium (V): 6.11 g/cm³
- Chromium (Cr): 7.19 g/cm³
- Manganese (Mn): 7.43 g/cm³
- Iron (Fe): 7.87 g/cm³
- Cobalt (Co): 8.90 g/cm³
- Nickel (Ni): 8.90 g/cm³
- Copper (Cu): 8.96 g/cm³
- Zinc (Zn): 7.14 g/cm³

3. **Arrange the Densities**: Now, arrange the elements based on their densities from lowest to highest.
- Scandium (2.98 g/cm³)
- Titanium (4.51 g/cm³)
- Vanadium (6.11 g/cm³)
- Chromium (7.19 g/cm³)
- Manganese (7.43 g/cm³)
- Iron (7.87 g/cm³)
- Zinc (7.14 g/cm³)
- Cobalt (8.90 g/cm³)
- Nickel (8.90 g/cm³)
- Copper (8.96 g/cm³)

4. **Correct Order**: After arranging, we find the correct order of densities:
- Scandium < Titanium < Vanadium < Chromium < Manganese < Iron < Zinc < Cobalt < Nickel < Copper

5. **Final Answer**: The correct order of the elements with respect to their density is:
- Scandium < Titanium < Vanadium < Chromium < Manganese < Iron < Zinc < Cobalt < Nickel < Copper