  We concentrate here on photon absorption as well as electron and positron
scattering upon endohedrals that consist of a fullerenes shell and an inner
atom A. The aim is to understand the effect of fullerene electron shell in
formation of corresponding cross-section. We consider the problem substituting
the action of a complex multiatomic fullerenes shell by a combination of static
pseudopotential and dynamic polarization potential. The electron correlations
in the atom A are taken into account in the frame of the random phase
approximation with exchange (RPAE). We demonstrate that the fullerenes shell
strongly affects the cross-sections, bringing in a number of peculiarities,
such as confinement resonances and giant-endohedral resonances and partial wave
Ramsauer-type minima. Numerical data are obtained for endohedrals A@C60 and
A@C60@C240, where A are noble gas atoms He, Ar and Xe.
