Assertion: atom's particle | /r/PartOf | atom
Facets:
Source sentences:
text: What are the three different tiny particles that make up an atom?
text: A proton is one of three main particles that make up the atom.
text: In the last section, we learned that atoms are, in fact, divisible, and that one of the subatomic particles making up an atom is a small, negatively charged entity called an "electron".