For 10 points, name this value symbolized Q.
Only multiplets with an average value of zero for this property have G-parity. The density of this quantity at the surface of a dielectric is given by the divergence of the polarization vector. This quantity is the same for all particles on the same downward-sloping line of a baryon octet diagram. This quantity is equal to the third component of isospin plus quantity one-half times baryon number plus strangeness according to the Gell-Mann-Nishijima formula. This quantity is the generator of the U(1) group, and a system of particles which each have nonzero values of this property has no (*) stable static configuration according to Earnshaw's theorem. Moving particles with this property generate magnetic fields. For 10 points, name this value symbolized Q.
Only multiplets with an average value of zero for this property have G-parity.
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