Which one of the following particles is not a baryon?
A)proton
B)neutron
C)pion
D)sigma particle
E)lambda particle

Question

Quizplus · Accepted Answer

Baryons are particles composed of three quarks, including protons and neutrons. Pions are mesons, which are composed of one quark and one antiquark. Sigma particles and lambda particles are also baryons composed of three quarks. Therefore, the particle that is not a baryon is the pion.

Which One of the Following Particles Is Not a Baryon