Question

sep develop models use colored pencils to draw models for a chlorine molecule, cl₂, and for a hydrogen chloride molecule, hcl. use the colors and relative sizes from the atom key on the previous page.

Explanation:

Use colored pencils to draw the molecular models of $Cl_2$ and $HCl$ according to the colors and relative - size guidelines from the atom key on the previous page.

Answer:

Draw a model of a chlorine molecule ($Cl_2$) and a hydrogen - chloride molecule ($HCl$) using colored pencils with colors and relative sizes as per the atom key on the previous page.