Answer:
First picture: Element
Second picture: Compound
Third picture: Mixture
Step-by-step explanation:
First picture:
It represents an element as all the atoms are the same.
Second picture:
The other type of atoms are shown as chemically bonded to the green atoms — in the diagram the green atoms and pink atoms are touching.
Third picture:
It is representing a mixture as the other atoms are not chemically bonded together with the green atoms — the green and orange atoms are seperate and are just mixed