To determine the correct order of the given elements based on their densities, we must evaluate each element's density value. Density is the mass per unit volume of a substance, and it is usually expressed in grams per cubic centimeter (g/cm³) for solids.
The elements provided are chromium (Cr), iron (Fe), cobalt (Co), copper (Cu), and zinc (Zn). Here are their approximate densities:
Chromium (Cr): 7.19 \, \text{g/cm}^3
Iron (Fe): 7.87 \, \text{g/cm}^3
Cobalt (Co): 8.90 \, \text{g/cm}^3
Copper (Cu): 8.96 \, \text{g/cm}^3
Zinc (Zn): 7.13 \, \text{g/cm}^3
Based on these values, we can order the elements by increasing density:
Zinc (Zn): 7.13 \, \text{g/cm}^3
Chromium (Cr): 7.19 \, \text{g/cm}^3
Iron (Fe): 7.87 \, \text{g/cm}^3
Cobalt (Co): 8.90 \, \text{g/cm}^3
Copper (Cu): 8.96 \, \text{g/cm}^3
Therefore, the correct order of the elements with respect to their density is Zn < Cr < Fe < Co < Cu.
This order matches the given option, confirming that the correct answer is:
