After a quick review of the textbook, rank the following elements in order of increasing density: (A) copper, (B) nickel, (C) titanium, (D) silicon.

Silicon (2.33 g/cm3) < Titanium (4.51 g/cm3) < Nickel (8.9 g/cm³) < Copper (8.96 g/cm³)

Explanation:

Density of copper = 8.96 g/cm³

Density of Nickel = 8.9 g/cm³

Density of Titanium = 4.51 g/cm3

density of silicon = 2.33 g/cm3

The correct order of above metals based on the increasing density is as follow

Silicon (2.33 g/cm3) < Titanium (4.51 g/cm3) < Nickel (8.9 g/cm³) < Copper (8.96 g/cm³)

Thus, copper has the highest density among all.