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

We need to arrange the given first-row transition metals in increasing order of their densities.

The approximate densities of the given elements are: Zn = 7.13 g/cm³, Cr = 7.19 g/cm³, Fe = 7.87 g/cm³, Co = 8.90 g/cm³, and Cu = 8.96 g/cm³.

Arranging these in increasing order of density: $$Zn < Cr < Fe < Co < Cu$$.

This matches Option (3).

The correct answer is Option (3).

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