For 10 points, name this quantity symbolized q that is measured in coulombs.
Either particle number or this quantity is the conserved quantity corresponding to the internal vector symmetry of the Dirac Lagrangian. A Majorana ("ma-yo-RA-na") spinor is invariant with respect to changes in this quantity. The impact of this quantity's spatial distribution on elastic scattering cross-sections is given by the form factor. Particles are categorized by their values for strangeness and this quantity on an (*) Eightfold Way diagram. The weak force has been found to violate the combined symmetry of parity and this quantity. For quarks, this quantity is either positive two-thirds or negative one-third. Flipping the sign of this quantity distinguishes matter from antimatter. For 10 points, name this quantity symbolized q that is measured in coulombs.
Either particle number or this quantity is the conserved quantity corresponding to the internal vector symmetry of the Dirac Lagrangian.
electric charge [accept q until read]