protons
type: Concept
broader: elementary particles

heavy ions
type: Concept
broader: elementary particles

physical phenomena
type: Concept
narrower: elementary particles

photons
type: Concept
broader: elementary particles

elementary particles
narrower: electrons
narrower: neutrons
narrower: heavy ions
narrower: mesons
narrower: phonons
narrower: photons
narrower: protons
broader: physical phenomena
type: Concept

concepts
type: Collection
type: ConceptGroup
member: elementary particles

mesons
type: Concept
broader: elementary particles

neutrons
type: Concept
broader: elementary particles

phonons
type: Concept
broader: elementary particles

electrons
type: Concept
broader: elementary particles