  We present a model of electron-atoms (elastic) scattering of electrons in
matter, applicable in a wide electron energy range from ~eV up to relativistic
ones. The approach based on the dynamic-structure factor considers dynamical
screening of atomic nuclei in a target by valence (collective) and core-shell
electrons, dependent on the incident electron velocity. The model allows
simulating electron transport in matter with a unified approach to the elastic
scattering. The cross section recovers the limiting cases of the
electron-phonon scattering in the low energy limit, and a screened-ion
scattering with the decreasing screening reducing to the scattering on a bare
nucleus in the high energy limit.
