Answer:
Images 1 and 4: atoms
Image 2 : compounds.
Image 3 (yellow doublets): molecules that are not compounds.
Step-by-step explanation:
Atoms are the smallest entity and are made of three subatomic particles: protons, electrons and neutrons.
Two or more atoms are bonded together to form a molecule. A molecule can have atoms of same or different elements.
Compounds are the molecules that have atoms of different elements only.
Image 1 and 4 represent atoms while image 2 represents compounds. Image 3 (yellow doublets) represents molecules that are not compounds.