All known quarks and antiquarks have:

Question

Quizplus · Accepted Answer

Quarks and antiquarks have fractional charges that are multiples of e/3 and also have baryon numbers that are either +1/3 or -1/3. This is because quarks have a fractional electric charge of either +2/3 or -1/3, and in order for baryons (which are made up of three quarks) to have integer charges, the sum of the quark charges must be an integer multiple of e/3. Thus, all known quarks and antiquarks have charges that are multiples of e/3 and baryon numbers that are either +1/3 or -1/3.

All Known Quarks and Antiquarks Have