Assertion: atom | /r/HasProperty | sub-atomic particles
Facets:
Source sentences:
text: It is composed of sub-atomic particles ‘“ neutrons, protons, and electrons.
text: But in the latter part of the 19th century and early part of the 20th, scientists discovered that atoms are composed of certain subatomic particles and that, no matter what the element, the same subatomic particles make up the atom.
text: Though the word atom originally denoted a particle that cannot be cut into smaller particles, in modern scientific usage the atom is composed of various subatomic particles.