12. Patrik works at a company that makes
paper and needs a chemical to make the
paper brighter. He mixed two colorless
substances together in a sealed container.
The diagram above shows the repeating
groups of atoms that make up the two
starting substances.
After mixing. Patrik found two white
substances in the sealed container.
(Nothing had escaped.) Which of the
diagrams to the left shows the repeating
groups of atoms that make up the ending
substances?