How Many Elementary Particles Are There, Really?

# Summary The number of elementary particles in nature is ambiguous and depends on how physicists choose to count them. While the Standard Model displays 17 particles—12 matter particles (fermions), 4 force-carrying particles (bosons), and the Higgs boson—this count increases when accounting for antiparticles and other factors, with plausible answers ranging from 17 to 995.5. The difficulty in establishing a definitive count reveals fundamental uncertainties at the edge of known physics.