  We present lattice-QCD results for the electromagnetic form factors of the
proton and neutron including both quark-connected and -disconnected
contributions. The parametrization of the $Q^2$-dependence of the form factors
is combined with the extrapolation to the physical point. In this way, we
determine the electric and magnetic radii and the magnetic moments of the
proton and neutron. For the proton, we obtain at the physical pion mass and in
the continuum and infinite-volume limit $\sqrt{\langle r_E^2 \rangle^p} =
0.820(14)$ fm, $\sqrt{\langle r_M^2 \rangle^p} = 0.8111(89)$ fm, and $\mu_M^p =
2.739(66)$, where the errors include all systematics.
