  We discuss the stability of atoms and nucleons in the presence of
multidimensional gravity characterized by the unified energy scale 1TeV. We
point out that the multidimensional gravitational attraction can create
additional bound states deep inside of atomic and nucleon constituents. These
states would be characterized by sizes comparable to the TeV scale distance. We
show that shallow gravity induced bound states between an electron and a quark
are ruled out, because collapse processes in atoms to such bound states would
occur on time scales which are in contradiction to current data on the
stability of ordinary matter. The gravitational attraction may also produce
diquark states, which should be considered in addition to those discussed in
the literature. The estimates indicate that, for TeV scale gravity, the problem
of UV divergencies and UV renormalization is crucial. Some universal
renormalization mechanism should exist, which stabilizes atoms in the presence
of multidimensional gravity.
