any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1

the positively charged dense center of an atom

the antiparticle of a neutron

an unstable negatively charged proton; the antiparticle of a proton

an elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus

a stable particle with positive charge equal to the negative charge of an electron

the positively charged dense center of an atom