The technique of impact-collision ion scattering spectroscopy (ICISS) was used to investigate the atomic structure of the Ag (110) surface. The projectiles employed were 5 keV 7Li + ions, and polar angle scans were collected for several azimuths and scattering angles. The use of low energies makes ion scattering especially sensitive to the atomic structure in the surface plane. Analysis of the surface flux peak for the [112̄] azimuthal scan demonstrated that the surface was not a complete monolayer, but rather contained random vacancies. Comparison of the experimental data for several different azimuths and scattering angles with computer simulations based on the two-atom cross-section model were consistent with an otherwise bulklike Ag (110) surface with a vacancy concentration of 10-15%.