Assertion: atom's particle | /r/HasProperty | lepton
Facets:
Source sentences:
text: All the particles that make up ordinary matter (leptons and quarks) are elementary fermions, while all the force carriers are elementary bosons.
text: They are a type of fundamental particles called leptons.
text: At the most fundamental level, matter is composed of elementary particles, known as quarks and leptons (the class of elementary particles that includes electrons).