Until now, we have focused almost exclusively on metals. Now, we introduce graphene. Graphene is a two-dimensional system which, with some degree of simplification, can be considered a metallic system, although is a unique material with quite unusual behavior of FOs. It has the ability to exhibit Friedel oscillations, similar to all systems with a two-dimensional electron gas, but decay faster. Interestingly, the interactions of adsorbants change character depending on whether they belong to the same or the other sublattice.