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neutrons, and a cloud of orbiting electrons. typically, science considers these composite particles matter because they have both rest mass and volume. by contrast, massless particles, such as photons, are not considered matter, because they have neither rest mass nor volume. however, not all particles with
rest mass have a classical volume, since fundamental particles such as quarks and leptons (sometimes equated with matter) are considered "point particles" with no effective size or volume. nevertheless, quarks and leptons together make up "ordinary matter", and their interactions contribute to the effective...
https://www.askdifference.com/matter-vs-matters/