Question

classify the picture with the correct label.
element
compound
mixture of elements
mixture of compounds

Explanation:

A compound is a substance formed when two or more elements chemically bond together. In the given picture, there are identical molecules (each molecule has the same combination of atoms). Since all the molecules are the same and composed of different types of atoms (as indicated by the different - colored spheres in a molecule - like structure), it is a compound. An element would have only one type of atom. A mixture of elements would have different single - atom species. A mixture of compounds would have different types of molecules.

Answer:

Compound