Question

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

Which combination of atoms will form a molecule, but not a compound?

W and X
X and Y
W and Z
Y and Z

Answer 1

Where is the picture?

All molecules that contain carbon (C) and at least hydrogen (H) atoms is one example until I see what that missing diagram says.