Question

Identify the correct decreasing order of densities of d-block elements.

Options

• V > Cr > Fe > Ni

• Ni > Fe > Cr > V

• Fe > Ni > V > Cr

• Cr > Fe > V > Ni

Answer 1

Ni > Fe > Cr > V

Explanation:

The correct order of densities of d-block elements are as follows:

Ni > Fe > Cr > V

Moving through a period, electrons have the same main quantum number, thus they do not make the atom bigger; instead, there are more protons and neutrons, resulting in an increase in the number of nuclei, and due to the effective rise in nucleus charge, the radius of the atom drops.

Density = `"mass"/"volume"`

Mass is increasing and volume is decreasing, overall we conclude that on moving left to right density increases.