  Complex plasma mixtures with three or more components are often encountered
in astrophysics or in inertial confinement fusion (ICF) experiments. For
mixtures containing species with large differences in atomic number Z, the
modeling needs to consider at the same time the kinetic theory for low-Z
elements combined with the theory of strongly coupled plasma for high-Z
elements, as well as all the intermediate situations that can appear in
multi-component systems. For such cases, we study the pair distribution
functions, self-diffusions, mutual diffusion and viscosity for ternary mixtures
at extreme conditions. These quantities can be produced from first principles
using orbital free molecular dynamics at the computational expense of very
intensive simulations to reach good statistics. Utilizing the first-principles
results as reference data, we assess the merit of a global analytic model for
transport coefficients, Pseudo-Ions in Jellium (PIJ), based on an
iso-electronic assumption ( iso-n e ). With a multi-component hypernetted-chain
integral equation, we verify the quality of the iso-n e prescription for
describing the static structure of the mixtures. This semi-analytical modeling
compares well with the simulation results and allows one to consider plasma
mixtures not accessible to simulations. Applications are given for the mix of
materials in ICF experiments. A reduction of a multicomponent mixture to an
effective binary mixture is also established in the hydrodynamic limit and
compared with PIJ estimations for ICF relevant mixtures.
