This chart shows four atoms, labeled W, X, Y, and Z. These atoms can combine with each other to form molecules.

To determine which combination of atoms will form a molecule, but not a compound, we need to understand the definitions of a molecule and a compound:

• A molecule is formed when two or more atoms bond together, regardless of whether the atoms are of the same or different elements.
• A compound is a specific type of molecule that consists of two or more different elements.

Based on these definitions, a combination of the same type of atoms will form a molecule but not a compound.

If the chart indicated that atoms W and X are the same (e.g., both are the same element), then choosing W and X would result in a molecule that is not a compound. If W and Z, X and Y, or Y and Z consist of different types of atoms, they would form compounds.

Without knowing the specific identities of atoms W, X, Y, and Z, we conclude that any combination of identical atoms will qualify. Thus, the answer depends strictly on which atoms are identical or different in the chart.

If W is the same as X, then:

W and X would form a molecule but not a compound.

If these atoms are all different, then you would need to choose combinations that consist of the same element to form a molecule but not a compound.

Please refer to the chart for specific atom identities to make a final determination.