  We study how the elements of the leptonic right-handed mixing matrix can be
determined at the LHC in the minimal Left-Right symmetric extension of the
standard model. We do it by explicitly relating them with physical quantities
of the Keung-Senjanovi\'c process and the lepton number violating decays of the
right doubly charged scalar. We also point out that the left and right doubly
charged scalars can be distinguished at the LHC, without measuring the
polarization of the final state leptons coming from their decays.
