Results of calculations of the electronic stopping power and the energy loss straggling for low velocity H-, He-, Li- and Be-like projectiles in the de- generate electron gas are reported. The Hartree-Fock-Slater description of the projectile and the dielectric function method were used. The size param- eter Zmin of the charge distributions calculated from a variational principle depends on the characteristics of the medium. The stopping and straggling effective charges Zef of a projectile were analysed. They were found to differ with each other and to depend on the one-electron radius rs, on the pro- jectile atomic number Zi and on the number of electrons Ni carried by the projectile.
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