The particles that make up the atom. The elementary particles include electrons and a large number of particles, including protons and neutrons, that exist inside the nucleus of atoms. Strictly speaking, the term elementary as applied to most of the particles in the nucleus is inaccurate, for scientists now believe that all the particles except electrons are made of still more elementary particles called quarks.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
How to use elementary particles in a sentence
I should say how fundamental elementary particles acquire their mass.
But nevertheless, even in questions as to the constitution of elementary particles, it retains part of its importance.Sidelights on Relativity | Albert Einstein
They are all alike composed of the same elementary particles—different compounds of the same primitive substance.Religion and Science | John Charlton Hardwick
The behavior of the muon is well understood, but its role as one of the elementary particles is unknown.LRL Accelerators | Lawrence Radiation Laboratory
Mesons are elementary particles intermediate in mass between the electron and proton.LRL Accelerators | Lawrence Radiation Laboratory
That is, the relations between certain elementary particles of matter undergo a change, and submit to new combinations.A Defence of Poetry and Other Essays | Percy Bysshe Shelley