The change illustrated in the diagram is atoms that formed molecules; option C.
What is matter?
Matter is anything that has mass and occupies space.
Matter can exist as pure or impure substances.
Pure substances are the elements and compounds.
Impure substances are the mixtures.
All forms of matter are composed of atoms.
When atoms of substances combine, the form molecules of the same element or molecules of a compound.
Atoms can also form ions by the loss or gain of electrons.
Therefore, the illustrated diagram shows atoms of the same substance combining to form molecules.
Learn more about atoms and molecules at: https://brainly.com/question/6258301
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