Okay, now I see Diagram F. It shows only individual black circles. There are no different types of atoms or molecules; it's just one type of atom. This represents an element in its atomic form, not a compound. A compound requires at least two different elements chemically bonded together.
Based on my analysis of all six diagrams, I can now provide the final answer.
The diagrams that represent compounds are B and C. Both show a single type of molecule composed of two different types of atoms (black and white in B, white and grey in C) chemically bonded together. The other diagrams represent either mixtures (A and E) or elements (D and F).
Parent Tip: Review the logic above to help your child master the concept of elements and compounds worksheet.