  Lorentz symmetry is one of the cornerstone of both general relativity and the
standard model of particle physics. We study the violation of Lorentz symmetry
in some basic phenomena in atomic physics. Using the Green's function, and the
source 4-current, the differential equation of 4-vector of electromagnetic
potential is solved and the modified coulomb potential is obtained by some
researchers. Using modified Coulomb potential, we find the corrections due to
LIV on the spectrum of Hydrogen and Helium atoms. We also investigate the
consequences of LIV on Stark, Zeeman and Spin orbit effects and obtain some
upper bounds for the LIV coefficients.
