  We discuss scalar mesons properties on the light of chiral dynamics.
Considering them as the chiral partners of pseudo-scalar mesons we propose an
explanation to their unusual properties based on non-trivial vacuum effects
coming from the interplay between spontaneous breaking of chiral symmetry and
the violation of $U_A(1)$ symmetry by instantons. Including vector mesons as
external sources we work out predictions for radiative decays of vector mesons
and compare some of them with recent experimental results from high luminosity
$\Phi$ factories.
